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Financial Instruments - Summary of Activity in Accumulated Other Comprehensive Income Related to Derivatives (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Before-Tax Amount      
Accumulated derivative net losses, beginning of period $ (62) $ (20) $ 1
Net changes in fair value of derivatives 82 (135) 3
Net losses reclassified from accumulated other comprehensive income into income (25) 93 (24)
Accumulated derivative net losses, end of period (5) (62) (20)
Income Tax      
Accumulated derivative net losses, beginning of period 8 (2) 0
Net changes in fair value of derivatives (8) 24 (4)
Reclassification from AOCI, Current Period, Tax (1) (14) 2
Accumulated derivative net losses, end of period (1) 8 (2)
After-Tax Amount      
Accumulated derivative net losses, beginning of period (54) (22) 1
Net changes in fair value of derivatives 74 (111) (1)
Net losses reclassified from accumulated other comprehensive income into income (26) 79 (22)
Accumulated derivative net losses, end of period $ (6) $ (54) $ (22)