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Accumulated Other Comprehensive Income (Loss) - Components of OCI (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Unrealized gain (loss) on cash flow hedges      
Gross Amount $ 57 $ (42) $ (21)
Income Taxes (9) 10 (2)
Net Amount 48 (32) (23)
Changes in retirement plans’ funded status      
Gross Amount (10) (115) 620
Income Taxes 7 3 (143)
Net Amount (3) (112) 477
Foreign currency translation      
Gross Amount (735) 71 (317)
Income Taxes 0 0 0
Net Amount (735) 71 (317)
Share of other comprehensive loss of entities using the equity method      
Gross Amount 20 (8) (35)
Income Taxes 0 0 0
Net Amount 20 (8) (35)
Other comprehensive income (loss)      
Gross Amount (668) (94) 247
Income Taxes (2) 13 (145)
Other comprehensive income (loss), net of tax $ (670) $ (81) $ 102