Annual report pursuant to Section 13 and 15(d)

PENSION AND POST RETIREMENT BENEFITS (Components of Accumulated Other Comprehensive Loss (Income) (Details)

v3.20.4
PENSION AND POST RETIREMENT BENEFITS (Components of Accumulated Other Comprehensive Loss (Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Other Comprehensive Income (Loss), Defined Benefit Plan, (Gain) Loss Arising During Period, before Tax $ (219) $ 50
Actual returns on assets (over) under estimate (332) (44)
Amortization of net actuarial loss (27) (24)
Amortization of prior service credit (cost) (1) (1)
Current year prior service cost 6 0
Other (27) 7
Other Postretirement Benefits Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Other Comprehensive Income (Loss), Defined Benefit Plan, (Gain) Loss Arising During Period, before Tax (15) (6)
Actual returns on assets (over) under estimate (26) (18)
Amortization of net actuarial loss (3) (5)
Amortization of prior service credit (cost) 2 2
Current year prior service cost 0 0
Other (2) (5)
Change in Assumptions for Defined Benefit Plans, Discount Rates [Member] | Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Other Comprehensive Income (Loss), Defined Benefit Plan, (Gain) Loss Arising During Period, before Tax 181 106
Change in Assumptions for Defined Benefit Plans, Discount Rates [Member] | Other Postretirement Benefits Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Other Comprehensive Income (Loss), Defined Benefit Plan, (Gain) Loss Arising During Period, before Tax 44 26
Change in Assumptions for Defined Benefit Plans, Demographic [Member] | Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Other Comprehensive Income (Loss), Defined Benefit Plan, (Gain) Loss Arising During Period, before Tax (3) 12
Change in Assumptions for Defined Benefit Plans, Demographic [Member] | Other Postretirement Benefits Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Other Comprehensive Income (Loss), Defined Benefit Plan, (Gain) Loss Arising During Period, before Tax (11) 4
Changes in Assumptions for Defined Benefit Plans, Mortality [Member] | Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Other Comprehensive Income (Loss), Defined Benefit Plan, (Gain) Loss Arising During Period, before Tax (16) (6)
Changes in Assumptions for Defined Benefit Plans, Mortality [Member] | Other Postretirement Benefits Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Other Comprehensive Income (Loss), Defined Benefit Plan, (Gain) Loss Arising During Period, before Tax (4) (4)
Changes in Assumptions for Defined Benefit Plans, Per Capita Claims [Member] | Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Other Comprehensive Income (Loss), Defined Benefit Plan, (Gain) Loss Arising During Period, before Tax 0 0
Changes in Assumptions for Defined Benefit Plans, Per Capita Claims [Member] | Other Postretirement Benefits Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Other Comprehensive Income (Loss), Defined Benefit Plan, (Gain) Loss Arising During Period, before Tax (10) (9)
Changes in Assumptions for Defined Benefit Plans, Other Actuarial (Gain) Loss [Member] | Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Other Comprehensive Income (Loss), Defined Benefit Plan, (Gain) Loss Arising During Period, before Tax 0 0
Changes in Assumptions for Defined Benefit Plans, Other Actuarial (Gain) Loss [Member] | Other Postretirement Benefits Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Other Comprehensive Income (Loss), Defined Benefit Plan, (Gain) Loss Arising During Period, before Tax (5) 3
Changes in Assumptions for Defined Benefit Plans, Actuarial (Gain) Loss [Member] | Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Other Comprehensive Income (Loss), Defined Benefit Plan, (Gain) Loss Arising During Period, before Tax 162 112
Changes in Assumptions for Defined Benefit Plans, Actuarial (Gain) Loss [Member] | Other Postretirement Benefits Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Other Comprehensive Income (Loss), Defined Benefit Plan, (Gain) Loss Arising During Period, before Tax $ 14 $ 20