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Income Taxes (Narrative) (Detail) - USD ($)
$ in Millions
Jan. 01, 2018
Jun. 30, 2018
Dec. 31, 2017
Non Variable Interest Entities [Line Items]      
NOL carryforward   $ 2,700  
Alternative minimum tax credit carryforward - Other assets   24  
Foreign tax credit   62  
Unrecognized Tax Benefits   $ 0 $ 0
New federal corporate tax rate 21.00%