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Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of period $ 32,532 $ 33,028 $ 33,070 $ 34,595
Total other comprehensive loss (344) (170) (287) (623)
Balance at end of period 32,324 32,429 32,324 32,429
Total        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of period (323) (644) (387) (180)
Other comprehensive income (loss) before reclassifications (328) (191) (268) (663)
Amounts reclassified from accumulated other comprehensive loss 2 4 6 12
Total other comprehensive loss (326) (187) (262) (651)
Balance at end of period (649) (831) (649) (831)
Cash Flow Hedges        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of period (116) (138) (121) (141)
Other comprehensive income (loss) before reclassifications 3 6 4 1
Amounts reclassified from accumulated other comprehensive loss 2 4 6 12
Total other comprehensive loss 5 10 10 13
Balance at end of period (111) (128) (111) (128)
Foreign Currency Translation        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of period (196) (500) (254) (33)
Other comprehensive income (loss) before reclassifications (331) (197) (273) (664)
Amounts reclassified from accumulated other comprehensive loss 0 0 0 0
Total other comprehensive loss (331) (197) (273) (664)
Balance at end of period (527) (697) (527) (697)
Pension Plans        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of period (11) (6) (12) (6)
Other comprehensive income (loss) before reclassifications 0 0 1 0
Amounts reclassified from accumulated other comprehensive loss 0 0 0 0
Total other comprehensive loss 0 0 1 0
Balance at end of period $ (11) $ (6) $ (11) $ (6)