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Shareholders' Equity - Summary of Change in Components of AOCI (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balances $ 3,618 $ 4,561
Foreign currency translation adjustment 159 (217)
Amounts reclassified to earnings of cash flow hedges, net of tax (1) 6
Ending balances 3,773 4,242
Derivatives    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balances 253  
Net change in fair value of derivatives, net of tax (110)  
Amounts reclassified to earnings of cash flow hedges, net of tax (1)  
Amounts attributable to noncontrolling interests 50  
Ending balances 192  
Pensions    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balances (15)  
Amounts attributable to noncontrolling interests 0  
Ending balances (15)  
Foreign Currency Translation    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balances (1,038)  
Foreign currency translation adjustment 159  
Amounts attributable to noncontrolling interests (73)  
Ending balances (952)  
Accumulated Other Comprehensive Income (Loss)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balances (800) (476)
Foreign currency translation adjustment 159  
Net change in fair value of derivatives, net of tax (110)  
Amounts reclassified to earnings of cash flow hedges, net of tax (1)  
Amounts attributable to noncontrolling interests (23)  
Ending balances $ (775) $ (573)