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Derivative Financial Instruments - Schedule of Derivative Instruments (Details) € in Millions, £ in Millions, CAD in Millions, AUD in Millions, $ in Millions	Dec. 31, 2015 EUR (€)	Dec. 31, 2015 USD ($)	Dec. 31, 2015 GBP (£)	Dec. 31, 2015 CAD	Dec. 31, 2015 AUD	Dec. 31, 2014 EUR (€)	Dec. 31, 2014 USD ($)	Dec. 31, 2014 GBP (£)	Dec. 31, 2014 CAD	Dec. 31, 2014 AUD
Fair Value of Derivative Instruments in the Consolidated Balance Sheets
Assets		$ 179					$ 143
Liabilities		(56)					(105)
Derivative asset subject to master netting agreements		179					142
Derivative liability subject to master netting agreements		51					96
Net derivative asset		128					46
Derivatives designated as hedging instruments \| Foreign exchange contracts
Fair Value of Derivative Instruments in the Consolidated Balance Sheets
Assets		179					95
Liabilities		0					0
Derivatives not designated as hedging instruments
Fair Value of Derivative Instruments in the Consolidated Balance Sheets
Assets		0					48
Liabilities		(56)					(105)
AUD \| Derivatives designated as hedging instruments \| Foreign exchange contracts
Fair Value of Derivative Instruments in the Consolidated Balance Sheets
Notional Value \| AUD					AUD 260					AUD 260
Assets		65					41
Liabilities		0					0
EUR \| Derivatives designated as hedging instruments \| Foreign exchange contracts
Fair Value of Derivative Instruments in the Consolidated Balance Sheets
Notional Value \| €	€ 200					€ 200
Assets		51					27
Liabilities		0					0
EUR \| Derivatives not designated as hedging instruments \| Foreign exchange contracts
Fair Value of Derivative Instruments in the Consolidated Balance Sheets
Notional Value \| €	€ 0					€ 22
Assets		0					1
Liabilities		0					0
GBP \| Derivatives designated as hedging instruments \| Foreign exchange contracts
Fair Value of Derivative Instruments in the Consolidated Balance Sheets
Notional Value \| £			£ 250					£ 250
Assets		39					18
Liabilities		0					0
CAD \| Derivatives designated as hedging instruments \| Foreign exchange contracts
Fair Value of Derivative Instruments in the Consolidated Balance Sheets
Notional Value \| CAD				CAD 110					CAD 110
Assets		24					9
Liabilities		0					0
USD \| Derivatives not designated as hedging instruments \| Interest rate contracts
Fair Value of Derivative Instruments in the Consolidated Balance Sheets
Notional Value		5,000					5,750
Assets		0					47
Liabilities		$ (56)					$ (105)