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Segment Reporting - Segment Result and Reconciliations to GAAP - Core Earnings Adjustments (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting, Revenue Reconciling Item [Line Items]        
Net interest income (loss) after provisions for loan losses $ 323 $ 256 $ 773 $ 434
Total other income (loss) 176 133 480 85
Goodwill and acquired intangible asset impairment and amortization 5 5 10 11
Income tax expense (benefit) 55 45 170 20
Net income 185 125 555 19
Total Adjustments [Member] | Adjustments [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Net interest income (loss) after provisions for loan losses 40 (29) 108 (53)
Total other income (loss) (10) (30) 13 (253)
Goodwill and acquired intangible asset impairment and amortization 5 5 10 11
Total Core Earnings adjustments to GAAP 25 (64) 111 (317)
Income tax expense (benefit) 5 (10) 25 (64)
Net income 20 (54) 86 (253)
Net Impact of Goodwill and Acquired Intangible Assets [Member] | Total Adjustments [Member] | Adjustments [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Goodwill and acquired intangible asset impairment and amortization 5 5 10 11
Total Core Earnings adjustments to GAAP (5) (5) (10) (11)
Net Impact of Derivative Accounting [Member] | Total Adjustments [Member] | Adjustments [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Net interest income (loss) after provisions for loan losses 40 (29) 108 (53)
Total other income (loss) (10) (30) 13 (253)
Total Core Earnings adjustments to GAAP $ 30 $ (59) $ 121 $ (306)