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Equity - AOCL (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Accumulated Other Comprehensive Loss    
Balance at the beginning of the period $ 2,951  
Balance at the end of the period 3,084  
Accumulated Translation Adjustment [Member]    
Accumulated Other Comprehensive Loss    
Balance at the beginning of the period (1,114) $ (1,089)
Other comprehensive gain (loss) before reclassification adjustments (85) (105)
(Gain) reclassified from accumulated OCL 311  
Net other comprehensive income (loss) 226 (105)
Balance at the end of the period (888) (1,194)
Hedging Activities    
Accumulated Other Comprehensive Loss    
Balance at the beginning of the period 42 (9)
Other comprehensive gain (loss) before reclassification adjustments 211 (50)
(Gain) reclassified from accumulated OCL (170) 56
Tax (provision) benefit (11) (2)
Net other comprehensive income (loss) 30 4
Balance at the end of the period 72 (5)
Accumulated Defined Benefit Plans Adjustment [Member]    
Accumulated Other Comprehensive Loss    
Balance at the beginning of the period (61) (60)
Balance at the end of the period (61) (60)
Accumulated Other Comprehensive Income (Loss) [Member]    
Accumulated Other Comprehensive Loss    
Balance at the beginning of the period (1,133) (1,158)
Other comprehensive gain (loss) before reclassification adjustments 126 (155)
(Gain) reclassified from accumulated OCL 141 56
Tax (provision) benefit (11) (2)
Net other comprehensive income (loss) 256 (101)
Balance at the end of the period $ (877) $ (1,259)