Annual report pursuant to Section 13 and 15(d)

INCOME TAXES Income Taxes (Schedule of Valuation Allowance) (Details)

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INCOME TAXES Income Taxes (Schedule of Valuation Allowance) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Valuation Allowance [Line Items]        
Deferred Tax Assets, Valuation Allowance $ 836 $ 441 $ 1,287 $ 1,983
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount     696  
Included in income tax expense (benefit) [Member]        
Valuation Allowance [Line Items]        
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount (3) (846) (691)  
Change in deferred assets in other comprehensive income [Member]        
Valuation Allowance [Line Items]        
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount 0 0 (5)  
Acquisition of noncontrolling interest [Member]        
Valuation Allowance [Line Items]        
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 398 $ 0 $ 0