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Financial Instruments, Derivatives and Hedging Activities - Gain (Losses) Recognized in Income (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Hedging relationships      
Gains expected to be reclassified into earnings during the next twelve months, net of tax   $ 85  
Gains expected to be reclassified into earnings during the next twelve months, income tax effect   $ 30  
Fair Value Hedging | Interest Rate Contracts | Financing costs, net      
Hedging relationships      
Gains (losses) recognized in income, Hedging instruments $ (4)   $ (1)
Gains (losses) recognized in income, Hedged item $ 4   $ 1