Fair Value of Financial Instruments (Schedule of Effective Portion of the Pre-tax Loss Reclassified from AOCL into Interest Expense on the Consolidated Statements of Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Pre-Tax Loss Reclassified from AOCL into Income (Effective Portion)	$ 8	$ 16	$ 17	$ 30