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Fair Value Measurement - Quantitative Information about Level 3 Fair Value Measurements (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available for sale (amortized cost of $87.0 billion and $94.9 billion and allowance for credit losses of $3 million and $1 million as of December 31, 2022 and 2021, respectively) | $ 76,919 | $ 95,261 |  |
Recurring |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available for sale (amortized cost of $87.0 billion and $94.9 billion and allowance for credit losses of $3 million and $1 million as of December 31, 2022 and 2021, respectively) | 76,919 | 95,261 |  |
Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available for sale (amortized cost of $87.0 billion and $94.9 billion and allowance for credit losses of $3 million and $1 million as of December 31, 2022 and 2021, respectively) | 378 | 267 |  |
Retained interests in securitizations | 36 | 41 |  |
Net derivative assets (liabilities) | 5 | 19 | $ 31 | $ 26
RMBS |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available for sale (amortized cost of $87.0 billion and $94.9 billion and allowance for credit losses of $3 million and $1 million as of December 31, 2022 and 2021, respectively) | 62,589 | 73,616 |  |
RMBS | Recurring |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available for sale (amortized cost of $87.0 billion and $94.9 billion and allowance for credit losses of $3 million and $1 million as of December 31, 2022 and 2021, respectively) | 62,589 | 73,616 |  |
RMBS | Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available for sale (amortized cost of $87.0 billion and $94.9 billion and allowance for credit losses of $3 million and $1 million as of December 31, 2022 and 2021, respectively) | 236 | 258 |  |
CMBS | Recurring |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available for sale (amortized cost of $87.0 billion and $94.9 billion and allowance for credit losses of $3 million and $1 million as of December 31, 2022 and 2021, respectively) | 7,870 | 9,369 |  |
CMBS | Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available for sale (amortized cost of $87.0 billion and $94.9 billion and allowance for credit losses of $3 million and $1 million as of December 31, 2022 and 2021, respectively) | $ 142 | $ 9 |  |
Yield | RMBS | Recurring | Level 3 | Discounted cash flows | Minimum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available-for-sale, measurement input | 0.03 | 0 |  |
Yield | RMBS | Recurring | Level 3 | Discounted cash flows | Maximum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available-for-sale, measurement input | 0.12 | 0.21 |  |
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 | 0.07 | 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 | 0.04 | 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 | 0.05 | 0.02 |  |
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 | 0.05 | 0.01 |  |
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 | 0.09 |  |
Voluntary prepayment rate | Recurring | Level 3 | Discounted cash flows | Maximum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Retained interests, measurement input | 0.18 | 0.18 |  |
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 | 0.04 | 0.05 |  |
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 | 0.20 | 0.40 |  |
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 | 0.08 | 0.11 |  |
Default rate | Recurring | Level 3 | Discounted cash flows | Minimum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Retained interests, measurement input | 0.01 | 0.03 |  |
Default rate | Recurring | Level 3 | Discounted cash flows | Maximum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Retained interests, measurement input | 0.01 | 0.04 |  |
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 | 0.01 |  |
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 | 0.11 | 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 | 0.62 | 0.72 |  |
Loss severity | Recurring | Level 3 | Discounted cash flows | Maximum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Retained interests, measurement input | 2.91 | 1.51 |  |
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 | 0.80 | 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 | 0.58 | 0.65 |  |
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 | 30 months | 29 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 | 43 months | 36 months |  |
Discount rate | Recurring | Level 3 | Discounted cash flows | Minimum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Retained interests, measurement input | 0.04 | 0.02 |  |
Discount rate | Recurring | Level 3 | Discounted cash flows | Maximum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Retained interests, measurement input | 0.07 | 0.08 |  |
Swap rates | Recurring | Level 3 | Discounted cash flows | Minimum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Net derivative assets (liabilities), measurement input | 0.03 | 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 | 0.04 | 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 | 0.04 | 0.02 |  |

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