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Segment Reporting - Segment Result and Reconciliations to GAAP - Core Earnings Adjustments (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Segment Reporting, Revenue Reconciling Item [Line Items]    
Net interest income (loss) after provisions for loan losses $ 233 $ 375
Total other income (loss) 152 160
Goodwill and acquired intangible asset impairment and amortization 6 4
Income tax expense (benefit) 53 103
Net income (loss) 88 181
Total Adjustments [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Net interest income (loss) after provisions for loan losses 6 70
Total other income (loss) (29) (16)
Goodwill and acquired intangible asset impairment and amortization 6 4
Total "Core Earnings" adjustments to GAAP (29) 50
Income tax expense (benefit) (10) 16
Net income (loss) (19) 34
Net Impact of Goodwill and Acquired Intangible Assets [Member] | Total Adjustments [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Goodwill and acquired intangible asset impairment and amortization 6 4
Total "Core Earnings" adjustments to GAAP (6) (4)
Net Impact of Derivative Accounting [Member] | Total Adjustments [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Net interest income (loss) after provisions for loan losses 6 70
Total other income (loss) (29) (16)
Total "Core Earnings" adjustments to GAAP $ (23) $ 54