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Other Assets - Schedule of Other Assets (Detail) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract] |  |
Accrued interest receivable | $ 1,889 | $ 1,933
Benefit and insurance-related investments | 467 | 469
Income tax asset, net | 358 | 454
Derivatives at fair value | 246 | 307
Accounts receivable | 129 | 118
Fixed assets, net | 113 | 116
Other | 70 | 95
Total | $ 3,272 | $ 3,492

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