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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 $ 249
State 81 54 33
Foreign 127 131 52
Total current provision 684 493 334
Deferred provision (benefit):      
Federal (979) (171) 46
State (24) (14) 4
Foreign (2) (17) (9)
Total deferred provision (1,005) (202) 41
Total provision for income taxes (321) 291 375
Provision for income taxes is based on pre-tax income from continuing operations      
United States 530 503 852
Foreign 446 334 173
Earnings from continuing operations before income taxes and equity method investment earnings $ 976 $ 837 $ 1,025