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Equity, Changes in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Changes in Accumulated Other Comprehensive Loss, By Component, Net of Tax    
Beginning balance, accumulated other comprehensive loss, net of tax $ 18,430  
Other comprehensive income (loss) before reclassifications (54) $ 72
Amounts reclassified from accumulated other comprehensive loss 53 17
Other comprehensive income (loss) (1) 89
Ending balance, accumulated other comprehensive loss, net of tax 18,821  
Accumulated Other Comprehensive Loss [Member]    
Changes in Accumulated Other Comprehensive Loss, By Component, Net of Tax    
Beginning balance, accumulated other comprehensive loss, net of tax (1,008) (1,254)
Ending balance, accumulated other comprehensive loss, net of tax (1,009) (1,165)
Foreign Currency Translation Adjustment [Member]    
Changes in Accumulated Other Comprehensive Loss, By Component, Net of Tax    
Beginning balance, accumulated other comprehensive loss, net of tax (562) (515)
Other comprehensive income (loss) before reclassifications 13 76
Amounts reclassified from accumulated other comprehensive loss 0 0
Other comprehensive income (loss) 13 76
Ending balance, accumulated other comprehensive loss, net of tax (549) (439)
Defined Benefit Plans Items [Member]    
Changes in Accumulated Other Comprehensive Loss, By Component, Net of Tax    
Beginning balance, accumulated other comprehensive loss, net of tax (441) (737)
Other comprehensive income (loss) before reclassifications (3) 1
Amounts reclassified from accumulated other comprehensive loss 7 8
Other comprehensive income (loss) 4 9
Ending balance, accumulated other comprehensive loss, net of tax (437) (728)
Gains (Losses) on Cash Flow Hedges [Member]    
Changes in Accumulated Other Comprehensive Loss, By Component, Net of Tax    
Beginning balance, accumulated other comprehensive loss, net of tax (5) (2)
Other comprehensive income (loss) before reclassifications (64) (5)
Amounts reclassified from accumulated other comprehensive loss 46 9
Other comprehensive income (loss) (18) 4
Ending balance, accumulated other comprehensive loss, net of tax $ (23) $ 2