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Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period $ 34,595 $ 2,293 $ 2,731
Total other comprehensive loss (172) (121) (13)
Balance at end of period 33,070 34,595 2,293
Total      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period (180) (67) (54)
Other comprehensive (loss) income before reclassifications (222) (122)  
Amounts reclassified from accumulated other comprehensive loss 15 9  
Total other comprehensive loss (207) (113) (13)
Balance at end of period (387) (180) (67)
Cash Flow Hedges      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period (141) (16)  
Other comprehensive (loss) income before reclassifications 5 (134)  
Amounts reclassified from accumulated other comprehensive loss 15 9  
Total other comprehensive loss 20 (125)  
Balance at end of period (121) (141) (16)
Foreign Currency Translation      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period (33) (49)  
Other comprehensive (loss) income before reclassifications (221) 16  
Amounts reclassified from accumulated other comprehensive loss 0 0  
Total other comprehensive loss (221) 16  
Balance at end of period (254) (33) (49)
Pension Plans      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period (6) (2)  
Other comprehensive (loss) income before reclassifications (6) (4)  
Amounts reclassified from accumulated other comprehensive loss 0 0  
Total other comprehensive loss (6) (4)  
Balance at end of period $ (12) $ (6) $ (2)