Risk Management (Summary of Fair Values and Location in Condensed Consolidated Balance Sheet) (Details) - Not Designated As Hedging Instruments - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	$ 6	$ 1
Fair value of derivative liabilities	3	7
Foreign exchange contracts | Other assets
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	6	1
Foreign exchange contracts | Other Liabilities
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	2	5
Interest agreements | Other assets
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	0	0
Interest agreements | Other Liabilities
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	$ 1	$ 2