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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax      
Balance at beginning of the period $ (2,272)    
Other comprehensive income (loss) 295 $ (429) $ 107
Balance at end of the period (1,972) (2,272)  
Net Effect of Exchange Rate Fluctuations      
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax      
Balance at beginning of the period (1,229) (813)  
Change before reclassifications (61) (267)  
Other comprehensive income (loss) (61) (416)  
Balance at end of the period (1,290) (1,229) (813)
Change in Certain Derivative Instruments      
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax      
Balance at beginning of the period (60) (14)  
Change before reclassifications 119 (156)  
Amounts reclassified from accumulated other comprehensive income (loss) (80) 112  
Translation effect 1 (2)  
Tax effect (1) (1)  
Other comprehensive income (loss) 39 (46)  
Balance at end of the period (21) (60) (14)
Employee Benefit Plans      
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax      
Balance at beginning of the period (983) (1,016)  
Change before reclassifications 165 (32)  
Amounts reclassified from accumulated other comprehensive income (loss) 148 68  
Translation effect 9 (9)  
Tax effect   2  
Other comprehensive income (loss) 322 33  
Balance at end of the period (661) (983) (1,016)
Accumulated Other Comprehensive Loss      
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax      
Balance at beginning of the period (2,272) (1,843)  
Change before reclassifications 223 (455)  
Amounts reclassified from accumulated other comprehensive income (loss) 68 180  
Translation effect 10 (11)  
Tax effect (1) 1  
Other comprehensive income (loss) 300 (429)  
Balance at end of the period $ (1,972) (2,272) $ (1,843)
Australia and New Zealand ("ANZ") business | Net Effect of Exchange Rate Fluctuations      
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax      
Amounts reclassified from accumulated other comprehensive income (loss)   (149)  
Australia and New Zealand ("ANZ") business | Change in Certain Derivative Instruments      
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax      
Amounts reclassified from accumulated other comprehensive income (loss)   1  
Australia and New Zealand ("ANZ") business | Employee Benefit Plans      
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax      
Amounts reclassified from accumulated other comprehensive income (loss)   4  
Australia and New Zealand ("ANZ") business | Accumulated Other Comprehensive Loss      
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax      
Amounts reclassified from accumulated other comprehensive income (loss)   $ (144)