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Fair Value Measurement - Quantitative Information about Level 3 Fair Value Measurements (Detail) $ in Millions | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
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Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available for sale (amortized cost of $78.6 billion and allowance for credit losses of $5 million as of March 31, 2020) | $ 81,423 | $ 79,213 |  |
Recurring |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available for sale (amortized cost of $78.6 billion and allowance for credit losses of $5 million as of March 31, 2020) | 81,423 | 79,213 |  |
Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available for sale (amortized cost of $78.6 billion and allowance for credit losses of $5 million as of March 31, 2020) | 409 | 442 |  |
Retained interests in securitizations | 59 | 66 |  |
Net derivative assets (liabilities) | 66 | 26 | $ 6 | $ (10)
RMBS |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available for sale (amortized cost of $78.6 billion and allowance for credit losses of $5 million as of March 31, 2020) | 65,741 | 64,338 |  |
RMBS | Recurring |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available for sale (amortized cost of $78.6 billion and allowance for credit losses of $5 million as of March 31, 2020) | 65,741 | 64,338 |  |
RMBS | Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available for sale (amortized cost of $78.6 billion and allowance for credit losses of $5 million as of March 31, 2020) | 373 | 429 |  |
CMBS | Recurring |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available for sale (amortized cost of $78.6 billion and allowance for credit losses of $5 million as of March 31, 2020) | 10,084 | 9,426 |  |
CMBS | Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available for sale (amortized cost of $78.6 billion and allowance for credit losses of $5 million as of March 31, 2020) | $ 36 | $ 13 |  |
Yield | RMBS | Recurring | Level 3 | Discounted cash flows | Minimum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available-for-sale, measurement input | 0.02 | 0.02 |  |
Yield | RMBS | Recurring | Level 3 | Discounted cash flows | Maximum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available-for-sale, measurement input | 0.25 | 0.18 |  |
Yield | RMBS | Recurring | Level 3 | Discounted cash flows | Weighted average |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available-for-sale, measurement input | 0.06 | 0.05 |  |
Yield | CMBS | Recurring | Level 3 | Discounted cash flows | Minimum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available-for-sale, measurement input | 0.01 | 0.02 |  |
Yield | CMBS | Recurring | Level 3 | Discounted cash flows | Maximum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available-for-sale, measurement input | 0.03 | 0.03 |  |
Yield | CMBS | Recurring | Level 3 | Discounted cash flows | Weighted average |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available-for-sale, measurement input | 0.02 | 0.02 |  |
Voluntary prepayment rate | Recurring | Level 3 | Discounted cash flows | Minimum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Retained interests, measurement input | 0.03 | 0.04 |  |
Voluntary prepayment rate | Recurring | Level 3 | Discounted cash flows | Maximum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Retained interests, measurement input | 0.15 | 0.14 |  |
Voluntary prepayment rate | RMBS | Recurring | Level 3 | Discounted cash flows | Minimum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available-for-sale, measurement input | 0.05 | 0.00 |  |
Voluntary prepayment rate | RMBS | Recurring | Level 3 | Discounted cash flows | Maximum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available-for-sale, measurement input | 0.18 | 0.18 |  |
Voluntary prepayment rate | RMBS | Recurring | Level 3 | Discounted cash flows | Weighted average |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available-for-sale, measurement input | 0.10 | 0.10 |  |
Default rate | Recurring | Level 3 | Discounted cash flows | Minimum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Retained interests, measurement input | 0.03 | 0.02 |  |
Default rate | Recurring | Level 3 | Discounted cash flows | Maximum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Retained interests, measurement input | 0.04 | 0.03 |  |
Default rate | RMBS | Recurring | Level 3 | Discounted cash flows | Minimum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available-for-sale, measurement input | 0.01 | 0.01 |  |
Default rate | RMBS | Recurring | Level 3 | Discounted cash flows | Maximum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available-for-sale, measurement input | 0.06 | 0.06 |  |
Default rate | RMBS | Recurring | Level 3 | Discounted cash flows | Weighted average |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available-for-sale, measurement input | 0.02 | 0.02 |  |
Loss severity | Recurring | Level 3 | Discounted cash flows | Minimum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Retained interests, measurement input | 0.70 | 0.74 |  |
Loss severity | Recurring | Level 3 | Discounted cash flows | Maximum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Retained interests, measurement input | 0.75 | 0.88 |  |
Loss severity | RMBS | Recurring | Level 3 | Discounted cash flows | Minimum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available-for-sale, measurement input | 0.30 | 0.30 |  |
Loss severity | RMBS | Recurring | Level 3 | Discounted cash flows | Maximum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available-for-sale, measurement input | 0.95 | 0.95 |  |
Loss severity | RMBS | Recurring | Level 3 | Discounted cash flows | Weighted average |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available-for-sale, measurement input | 0.67 | 0.67 |  |
Life of receivables (months) | Recurring | Level 3 | Discounted cash flows | Minimum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Retained interests, measurement input, life of receivables | 33 months | 35 months |  |
Life of receivables (months) | Recurring | Level 3 | Discounted cash flows | Maximum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Retained interests, measurement input, life of receivables | 52 months | 51 months |  |
Discount rate | Recurring | Level 3 | Discounted cash flows | Minimum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Retained interests, measurement input | 0.02 | 0.03 |  |
Discount rate | Recurring | Level 3 | Discounted cash flows | Maximum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Retained interests, measurement input | 0.11 | 0.10 |  |
Swap rates | Recurring | Level 3 | Discounted cash flows | Minimum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Net derivative assets (liabilities), measurement input | 0.01 | 0.02 |  |
Swap rates | Recurring | Level 3 | Discounted cash flows | Maximum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Net derivative assets (liabilities), measurement input | 0.01 | 0.02 |  |
Swap rates | Recurring | Level 3 | Discounted cash flows | Weighted average |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Net derivative assets (liabilities), measurement input | 0.01 | 0.02 |  |

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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