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Income Taxes (Schedule of Components of Income Tax Expense (Benefit)) (Allocation) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Expense (Benefit), Intraperiod Tax Allocation [Abstract]      
Tax expense per statements of earnings $ 317 $ 379 $ 335
Tax expense attributable to discontinued operations 1 (2) (3)
Unrealized (loss) gain on foreign currency translation 30 0 (5)
Other components of other comprehensive income 1 (5) (2)
Total income tax expense (benefit) allocated to other comprehensive income 31 (5) (7)
Tax benefit from exercise of stock options (32) (29) (40)
Total income tax expense $ 317 $ 343 $ 285