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Income Taxes (Schedule of Components of Income Tax Expense (Benefit)) (Allocation) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Expense (Benefit), Intraperiod Tax Allocation [Abstract]      
Tax expense per statements of earnings $ (319) $ 317 $ 379
Tax expense attributable to discontinued operations 0 1 (2)
Unrealized (loss) gain on foreign currency translation 0 30 0
Other components of other comprehensive income (11) 1 (5)
Total income tax expense (benefit) allocated to other comprehensive income (11) 31 (5)
Tax benefit from exercise of stock options 0 (32) (29)
Total income tax expense $ (330) $ 317 $ 343