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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Current provision:      
Federal $ 476 $ 308 $ 248
State 81 54 33
Foreign 127 131 52
Total current provision 684 493 333
Deferred provision (benefit):      
Federal (983) (147) 50
State (21) (12) 5
Foreign 1 (17) (9)
Total deferred provision (1,003) (176) 46
Total provision for income taxes (319) 317 379
Provision for income taxes is based on pre-tax income from continuing operations      
United States 580 571 864
Foreign 456 335 173
Earnings from continuing operations before income taxes and equity method investment earnings $ 1,036 $ 906 $ 1,037