Income Taxes (Schedule of Components of Income Tax Expense (Benefit) and Pre-tax Income from Continuing Operations) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current provision:
Federal	$ 308	$ 248	$ 248
State	54	33	32
Foreign	131	52	64
Total current provision	493	333	344
Deferred provision (benefit):
Federal	(147)	50	(4)
State	(12)	5	(2)
Foreign	(17)	(9)	(3)
Total deferred provision	(176)	46	(9)
Total provision for income taxes	317	379	335
Provision for income taxes is based on pre-tax income from continuing operations
United States	571	864	789
Foreign	335	173	264
Earnings from continuing operations before income taxes	$ 906	$ 1,037	$ 1,053

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