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Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Balance at beginning of period $ 33,070 $ 34,595
Total other comprehensive loss (158) (643)
Balance at end of period 32,586 33,287
Total    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Balance at beginning of period (387) (180)
Other comprehensive income (loss) before reclassifications (151) (634)
Amounts reclassified from accumulated other comprehensive loss 2 3
Total other comprehensive loss (149) (631)
Balance at end of period (536) (811)
Cash Flow Hedges    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Balance at beginning of period (121) (141)
Other comprehensive income (loss) before reclassifications 1 (8)
Amounts reclassified from accumulated other comprehensive loss 2 3
Total other comprehensive loss 3 (5)
Balance at end of period (118) (146)
Foreign Currency Translation    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Balance at beginning of period (254) (33)
Other comprehensive income (loss) before reclassifications (153) (626)
Amounts reclassified from accumulated other comprehensive loss 0 0
Total other comprehensive loss (153) (626)
Balance at end of period (407) (659)
Pension Plans    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Balance at beginning of period (12) (6)
Other comprehensive income (loss) before reclassifications 1 0
Amounts reclassified from accumulated other comprehensive loss 0 0
Total other comprehensive loss 1 0
Balance at end of period $ (11) $ (6)