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Segment Reporting - Segment Results and Reconciliations to GAAP - Core Earnings Adjustments (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Segment Reporting, Revenue Reconciling Item [Line Items]        
Net interest income (loss) after provisions for loan losses $ 212 $ 312 $ 836 $ 1,084
Total other income (loss) 150 160 507 641
Goodwill and acquired intangible asset impairment and amortization 10 4 17 14
Income tax expense (benefit) 32 47 173 217
Net income 105 173 540 728
Total Adjustments [Member] | Eliminations And Reconciling Items        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Net interest income (loss) after provisions for loan losses (7) 35 104 143
Total other income (loss) 40 (5) 161 8
Goodwill and acquired intangible asset impairment and amortization 10 4 17 14
Total Core Earnings adjustments to GAAP 23 26 248 137
Income tax expense (benefit) 5 2 64 27
Net income 18 24 184 110
Net Impact of Goodwill and Acquired Intangible Assets [Member] | Total Adjustments [Member] | Eliminations And Reconciling Items        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Goodwill and acquired intangible asset impairment and amortization 10 4 17 14
Total Core Earnings adjustments to GAAP (10) (4) (17) (14)
Net Impact of Derivative Accounting [Member] | Total Adjustments [Member] | Eliminations And Reconciling Items        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Net interest income (loss) after provisions for loan losses (7) 35 104 143
Total other income (loss) 40 (5) 161 8
Total Core Earnings adjustments to GAAP $ 33 $ 30 $ 265 $ 151