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Derivative Financial Instruments - Schedule of Notional Amounts of Outstanding Derivative Positions (Details)
£ in Millions, CAD in Millions, AUD in Millions, $ in Millions
Apr. 18, 2017
AUD
Apr. 18, 2017
GBP (£)
Apr. 18, 2017
CAD
Mar. 31, 2017
AUD
Mar. 31, 2017
GBP (£)
Mar. 31, 2017
CAD
Mar. 31, 2017
USD ($)
Jan. 31, 2017
USD ($)
Dec. 31, 2016
AUD
Dec. 31, 2016
GBP (£)
Dec. 31, 2016
CAD
Dec. 31, 2016
USD ($)
Derivatives, Fair Value [Line Items]                        
Derivative asset subject to master netting agreements             $ 133         $ 147
Interest rate collar contracts                        
Derivatives, Fair Value [Line Items]                        
Assets             133         147
Liabilities             0         0
Derivatives designated as hedges | Foreign exchange contracts                        
Derivatives, Fair Value [Line Items]                        
Assets             129         144
Liabilities             0         0
Derivatives designated as hedges | Foreign exchange contracts | Subsequent Event                        
Derivatives, Fair Value [Line Items]                        
Notional value | £   £ 150                    
Maturity of foreign exchange contracts, notional value AUD 111 £ 150 CAD 35                  
Derivatives designated as hedges | Foreign exchange contracts | AUD                        
Derivatives, Fair Value [Line Items]                        
Notional value | AUD       AUD 211         AUD 211      
Assets             48         57
Liabilities             0         0
Derivatives designated as hedges | Foreign exchange contracts | GBP                        
Derivatives, Fair Value [Line Items]                        
Notional value | £         £ 300         £ 300    
Assets             72         78
Liabilities             0         0
Derivatives designated as hedges | Foreign exchange contracts | CAD                        
Derivatives, Fair Value [Line Items]                        
Notional value | CAD           CAD 130         CAD 130  
Assets             9         9
Liabilities             0         0
Derivatives designated as hedges | Interest rate collar contracts                        
Derivatives, Fair Value [Line Items]                        
Notional value               $ 1,300        
Fixed interest rate               0.00%        
Interest rate cap (as a percent)               1.50%        
Derivatives designated as hedges | Interest rate collar contracts | Minimum                        
Derivatives, Fair Value [Line Items]                        
Interest rate floor (as a percent)               1.16%        
Derivatives designated as hedges | Interest rate collar contracts | Maximum                        
Derivatives, Fair Value [Line Items]                        
Interest rate floor (as a percent)               1.168%        
Derivatives designated as hedges | Interest rate collar contracts | USD                        
Derivatives, Fair Value [Line Items]                        
Notional value             4,300         3,000
Assets             4         3
Liabilities             $ 0         $ 0