Derivative Financial Instruments (Schedule of Interest Rate Swap Activity Recorded in the Consolidated Financial Statements) (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Hedging activities - Interest expense		$ (119)	$ (147)	$ (172)
Swap Derivative 1 Point 02 Percent Maturing January 2, 2016 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Expiration Date	Jan. 02, 2016		Jan. 02, 2016
Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest Income (Expense), Net		2	$ (4)	(11)
Ineffective portion - Other income (expense), net		$ 0	$ 0	$ 0