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Income Taxes - Consolidated Income Tax Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Federal $ 498 $ 421 $ 485
State and local 107 14 22
Total current provision 605 435 507
Deferred provision (131) (109) 92
Income tax expense $ 474 $ 326 $ 599