Derivative Financial Instruments and Hedging Activities - Amounts Recognized in Net income (Details) - Interest expense - net [Member] - Fair Value Hedging [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Derivative designated as fair value hedges	$ 0	$ 0
Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative designated as fair value hedges	(36)	20
Related Long Term Debt Converted To Floating Interest Rates By Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative designated as fair value hedges	$ 36	$ (20)