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Income Taxes (Narrative) (Detail) - USD ($)
$ in Millions
12 Months Ended
Jan. 01, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Non Variable Interest Entities [Line Items]        
Federal statutory rate   21.00% 35.00% 35.00%
NOL carryforward   $ 2,400    
Alternative minimum tax credit carryforward - Other assets   26    
Foreign tax credit   62 $ 62  
Unrecognized Tax Benefits   0 0  
Valuation allowance on net deferred tax asset   $ 834 $ 770  
New federal corporate tax rate 21.00%