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Fair Value Measurement - Quantitative Information about Level 3 Fair Value Measurements (Details) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available for sale (amortized cost of $97.8 billion and $97.6 billion and allowance for credit losses of $2 million and $1 million as of March 31, 2021 and December 31, 2020, respectively) | $ 99,165 | $ 100,445 |  |
Recurring |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available for sale (amortized cost of $97.8 billion and $97.6 billion and allowance for credit losses of $2 million and $1 million as of March 31, 2021 and December 31, 2020, respectively) | 99,165 | 100,445 |  |
Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available for sale (amortized cost of $97.8 billion and $97.6 billion and allowance for credit losses of $2 million and $1 million as of March 31, 2021 and December 31, 2020, respectively) | 336 | 439 |  |
Retained interests in securitizations | 50 | 55 |  |
Net derivative assets (liabilities) | 34 | 31 | $ 66 | $ 26
RMBS |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available for sale (amortized cost of $97.8 billion and $97.6 billion and allowance for credit losses of $2 million and $1 million as of March 31, 2021 and December 31, 2020, respectively) | 75,622 | 76,703 |  |
RMBS | Recurring |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available for sale (amortized cost of $97.8 billion and $97.6 billion and allowance for credit losses of $2 million and $1 million as of March 31, 2021 and December 31, 2020, respectively) | 75,622 | 76,703 |  |
RMBS | Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available for sale (amortized cost of $97.8 billion and $97.6 billion and allowance for credit losses of $2 million and $1 million as of March 31, 2021 and December 31, 2020, respectively) | 326 | 328 |  |
CMBS | Recurring |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available for sale (amortized cost of $97.8 billion and $97.6 billion and allowance for credit losses of $2 million and $1 million as of March 31, 2021 and December 31, 2020, respectively) | 11,274 | 11,735 |  |
CMBS | Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available for sale (amortized cost of $97.8 billion and $97.6 billion and allowance for credit losses of $2 million and $1 million as of March 31, 2021 and December 31, 2020, respectively) | $ 10 | $ 111 |  |
Yield | RMBS | Recurring | Level 3 | Discounted cash flows | Minimum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available-for-sale, measurement input | 0.01 | 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 | 0.19 | 0.12 |  |
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 | 0.03 | 0.03 |  |
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 | 0.01 |  |
Yield | CMBS | Recurring | Level 3 | Discounted cash flows | Maximum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available-for-sale, measurement input | 0.02 | 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 | 0.01 | 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 | 0.09 | 0.03 |  |
Voluntary prepayment rate | Recurring | Level 3 | Discounted cash flows | Maximum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Retained interests, measurement input | 0.12 | 0.13 |  |
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 | 0.03 | 0.08 |  |
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 | 0.15 | 0.15 |  |
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 | 0.02 | 0.03 |  |
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 | 0 |  |
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 | 0.11 | 0.11 |  |
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 | 0.49 | 0.55 |  |
Loss severity | Recurring | Level 3 | Discounted cash flows | Maximum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Retained interests, measurement input | 1.51 | 0.70 |  |
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 | 1 | 1 |  |
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 | 0.72 | 0.73 |  |
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 | 36 months | 37 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 | 46 months | 52 months |  |
Discount 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 |  |
Discount rate | Recurring | Level 3 | Discounted cash flows | Maximum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Retained interests, measurement input | 0.13 | 0.12 |  |
Swap rates | Recurring | Level 3 | Discounted cash flows | Minimum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Net derivative assets (liabilities), measurement input | 0.02 | 0.01 |  |
Swap rates | Recurring | Level 3 | Discounted cash flows | Maximum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Net derivative assets (liabilities), measurement input | 0.02 | 0.01 |  |
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 | 0.02 | 0.01 |  |

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