Quarterly report pursuant to Section 13 or 15(d)

PENSIONS AND OTHER POSTRETIREMENT BENEFITS - Pension and Other Postretirement Benefits (Details)

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PENSIONS AND OTHER POSTRETIREMENT BENEFITS - Pension and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jan. 04, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
OPEB contributions   $ 5   $ 5  
Pension Plan          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Service cost   14 $ 6 28 $ 11
Interest cost   26 15 52 23
Expected return on plan assets   (90) (37) (180) (55)
Net actuarial loss   8 6 16 13
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total   (42) (10) (84) (8)
Defined benefit pension contributions $ 118 7   153 4
Other Postretirement Benefit Plans, Defined Benefit          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Service cost   12 1 25 2
Interest cost   19 5 37 7
Expected return on plan assets   (10) (4) (20) (9)
Prior service credits   0 0 0 (1)
Net actuarial loss   1 0 2 1
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total   $ 22 2 $ 44 0
OPEB contributions     $ 0   $ 0