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Financial Instruments (Qualifying Hedging Activity Reported in Accumulated Other Comprehensive Earnings (Losses) Net of Income Taxes) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Hedging Activity, Affecting Accumulated Other Comprehensive Income [Roll Forward]        
Derivative (gains)/losses transferred to earnings $ (2) $ 13 $ (17) $ (12)
Change in fair value (31) (14) (37) (34)
Derivative Contract [Member] | Other Comprehensive Income (Loss) [Member]        
Hedging Activity, Affecting Accumulated Other Comprehensive Income [Roll Forward]        
Gain/(loss) at beginning of period, (18) (10) 3 35
Derivative (gains)/losses transferred to earnings (2) 13 (17) (12)
Change in fair value (31) (14) (37) (34)
Gain/(loss) as of September 30, $ (51) $ (11) $ (51) $ (11)