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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, 2023 USD ($) | Dec. 31, 2022 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available for sale (amortized cost of $90.8 billion and $87.0 billion and allowance for credit losses of $2 million and $3 million as of March 31, 2023 and December 31, 2022, respectively) | $ 81,925 | $ 76,919 |  |
Recurring |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available for sale (amortized cost of $90.8 billion and $87.0 billion and allowance for credit losses of $2 million and $3 million as of March 31, 2023 and December 31, 2022, respectively) | 81,925 | 76,919 |  |
Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available for sale (amortized cost of $90.8 billion and $87.0 billion and allowance for credit losses of $2 million and $3 million as of March 31, 2023 and December 31, 2022, respectively) | 392 | 378 |  |
Retained interests in securitizations | 36 | 36 |  |
Net derivative assets (liabilities) | 18 | 5 | $ 22 | $ 19
RMBS |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available for sale (amortized cost of $90.8 billion and $87.0 billion and allowance for credit losses of $2 million and $3 million as of March 31, 2023 and December 31, 2022, respectively) | 66,351 | 62,589 |  |
RMBS | Recurring |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available for sale (amortized cost of $90.8 billion and $87.0 billion and allowance for credit losses of $2 million and $3 million as of March 31, 2023 and December 31, 2022, respectively) | 66,351 | 62,589 |  |
RMBS | Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available for sale (amortized cost of $90.8 billion and $87.0 billion and allowance for credit losses of $2 million and $3 million as of March 31, 2023 and December 31, 2022, respectively) | 247 | 236 |  |
CMBS | Recurring |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available for sale (amortized cost of $90.8 billion and $87.0 billion and allowance for credit losses of $2 million and $3 million as of March 31, 2023 and December 31, 2022, respectively) | 8,429 | 7,870 |  |
CMBS | Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available for sale (amortized cost of $90.8 billion and $87.0 billion and allowance for credit losses of $2 million and $3 million as of March 31, 2023 and December 31, 2022, respectively) | $ 145 | $ 142 |  |
Yield | RMBS | Recurring | Level 3 | Discounted cash flows | Minimum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available-for-sale, measurement input | 0.04 | 0.03 |  |
Yield | RMBS | Recurring | Level 3 | Discounted cash flows | Maximum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available-for-sale, measurement input | 0.17 | 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 | 0.06 | 0.07 |  |
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 | 0.04 |  |
Yield | CMBS | Recurring | Level 3 | Discounted cash flows | Maximum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Securities available-for-sale, measurement input | 0.06 | 0.05 |  |
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 | 0.05 |  |
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 | 0.16 | 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 | 0.01 | 0.04 |  |
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 | 0.20 |  |
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 | 0.08 |  |
Default rate | Recurring | Level 3 | Discounted cash flows | Minimum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Retained interests, measurement input | 0.02 | 0.01 |  |
Default rate | Recurring | Level 3 | Discounted cash flows | Maximum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Retained interests, measurement input | 0.02 | 0.01 |  |
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 | 0.45 | 0.62 |  |
Loss severity | Recurring | Level 3 | Discounted cash flows | Maximum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Retained interests, measurement input | 1.63 | 2.91 |  |
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 | 0.80 |  |
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 | 0.57 | 0.58 |  |
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 | 32 months | 30 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 | 45 months | 43 months |  |
Discount rate | Recurring | Level 3 | Discounted cash flows | Minimum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Retained interests, measurement input | 0.05 | 0.04 |  |
Discount rate | Recurring | Level 3 | Discounted cash flows | Maximum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Retained interests, measurement input | 0.08 | 0.07 |  |
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 | 0.03 |  |
Swap rates | Recurring | Level 3 | Discounted cash flows | Maximum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Net derivative assets (liabilities), measurement input | 0.05 | 0.04 |  |
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 | 0.03 | 0.04 |  |

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