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Derivative Financial Instruments - Schedule of Derivative Instruments (Details)
€ in Millions, £ in Millions, CAD in Millions, AUD in Millions, $ in Millions
Feb. 24, 2017
USD ($)
Dec. 31, 2016
EUR (€)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
AUD
Dec. 31, 2016
GBP (£)
Dec. 31, 2016
CAD
Oct. 31, 2016
USD ($)
Oct. 31, 2016
AUD
Aug. 31, 2016
USD ($)
Aug. 31, 2016
GBP (£)
Aug. 31, 2016
CAD
Jan. 31, 2016
USD ($)
Dec. 31, 2015
EUR (€)
Dec. 31, 2015
USD ($)
Dec. 31, 2015
AUD
Dec. 31, 2015
GBP (£)
Dec. 31, 2015
CAD
Fair Value of Derivative Instruments in the Consolidated Balance Sheets                                  
Derivative asset subject to master netting agreements     $ 147                     $ 179      
Derivative liability subject to master netting agreements                           51      
Net derivative asset                           128      
Interest rate contracts                                  
Fair Value of Derivative Instruments in the Consolidated Balance Sheets                                  
Assets     147                     179      
Liabilities     0                     (56)      
Derivatives designated as hedging instruments | Foreign exchange contracts                                  
Fair Value of Derivative Instruments in the Consolidated Balance Sheets                                  
Assets     144                     179      
Liabilities     0                     0      
AUD | Derivatives designated as hedging instruments | Foreign exchange contracts                                  
Fair Value of Derivative Instruments in the Consolidated Balance Sheets                                  
Notional Value | AUD       AUD 211                     AUD 260    
Assets     57                     65      
Liabilities     0                     0      
Maturity of foreign exchange contracts, notional value | AUD               AUD 49                  
Maturity of foreign exchange contracts, net settlement value             $ 8                    
EUR | Derivatives designated as hedging instruments | Foreign exchange contracts                                  
Fair Value of Derivative Instruments in the Consolidated Balance Sheets                                  
Notional Value | €   € 0                     € 200        
Assets     0                     51      
Liabilities     0                     0      
Maturity of foreign exchange contracts, net settlement value                       $ 49          
GBP | Derivatives designated as hedging instruments | Foreign exchange contracts                                  
Fair Value of Derivative Instruments in the Consolidated Balance Sheets                                  
Notional Value | £         £ 300         £ 150           £ 250  
Assets     78                     39      
Liabilities     0                     0      
Maturity of foreign exchange contracts, notional value | £                   £ 100              
Maturity of foreign exchange contracts, net settlement value                 $ 25                
CAD | Derivatives designated as hedging instruments | Foreign exchange contracts                                  
Fair Value of Derivative Instruments in the Consolidated Balance Sheets                                  
Notional Value | CAD           CAD 130         CAD 95           CAD 110
Assets     9                     24      
Liabilities     0                     0      
Maturity of foreign exchange contracts, notional value | CAD                     CAD 75            
Maturity of foreign exchange contracts, net settlement value                 $ 14                
USD | Derivatives designated as hedging instruments | Interest rate collar contracts                                  
Fair Value of Derivative Instruments in the Consolidated Balance Sheets                                  
Notional Value     3,000                     0      
Assets     3                     0      
Liabilities     0                     0      
USD | Derivatives designated as hedging instruments | Interest rate collar contracts | Subsequent event                                  
Fair Value of Derivative Instruments in the Consolidated Balance Sheets                                  
Notional Value $ 1,300                                
USD | Derivatives not designated as hedging instruments | Interest rate contracts                                  
Fair Value of Derivative Instruments in the Consolidated Balance Sheets                                  
Notional Value     0                     5,000      
Assets     0                     0      
Liabilities     $ 0                     $ (56)