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Income Taxes (Schedule of Components of Income Tax Expense (Benefit)) (Allocation) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Expense (Benefit), Intraperiod Tax Allocation [Abstract]      
Tax expense (benefit) per statement of earnings $ 208 $ (321) $ 291
Tax expense (benefit) attributable to discontinued operations (1) 0 1
Unrealized (loss) gain on foreign currency translation 0 0 30
Other components of other comprehensive income 1 (11) 1
Total income tax expense (benefit) allocated to other comprehensive income 1 (11) 31
Tax benefit from exercise of stock options 0 0 (32)
Total income tax expense (benefit) $ 208 $ (332) $ 291