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Fair Value Measurement - Quantitative Information about Level 3 Fair Value Measurements (Details) $ in Millions | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
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Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 78,398 | $ 79,117
Recurring |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 78,398 | 79,117
Recurring | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 438 | 278
Retained interests in securitizations | 35 | 35
Net derivative assets (liabilities) | 54 | 58
Total RMBS |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 62,398 | 63,638
Total RMBS | Recurring |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 62,398 | 63,638
Total RMBS | Recurring | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 309 | 146
CMBS | Recurring |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 8,193 | 8,323
CMBS | Recurring | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 129 | $ 132
Yield | Total 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 | 0.02
Yield | Total RMBS | Recurring | Level 3 | Discounted cash flows | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Securities available-for-sale, measurement input | 0.14 | 0.19
Yield | Total 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 | 0.06 | 0.05
Yield | CMBS | Recurring | Level 3 | Discounted cash flows | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Securities available-for-sale, measurement input | 0.07 | 0.07
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 | 0.06 | 0.05
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 | 31 months | 33 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 | 73 months | 69 months
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 | 0.09 | 0.09
Voluntary prepayment rate | Total 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
Voluntary prepayment rate | Total 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 | 0.12
Voluntary prepayment rate | Total 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 | 0.07
Discount rate | Recurring | Level 3 | Discounted cash flows | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Retained interests, measurement input | 0.05 | 0.05
Discount rate | Recurring | Level 3 | Discounted cash flows | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Retained interests, measurement input | 0.13 | 0.14
Default rate | Recurring | Level 3 | Discounted cash flows | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Retained interests, measurement input | 0.01 | 0.02
Default rate | Recurring | Level 3 | Discounted cash flows | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Retained interests, measurement input | 0.01 | 0.02
Default rate | Total 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 | Total RMBS | Recurring | Level 3 | Discounted cash flows | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Securities available-for-sale, measurement input | 0.10 | 0.10
Default rate | Total 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 | 0.01
Loss severity | Recurring | Level 3 | Discounted cash flows | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Retained interests, measurement input | 0.54 | 0.53
Loss severity | Recurring | Level 3 | Discounted cash flows | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Retained interests, measurement input | 1.55 | 1.63
Loss severity | Total 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 | Total 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 | Total RMBS | Recurring | Level 3 | Discounted cash flows | Weighted average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Securities available-for-sale, measurement input | 0.61 | 0.61
Swap rates | Recurring | Level 3 | Discounted cash flows | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Net derivative assets (liabilities), measurement input | 0.04 | 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 | 0.05
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 | 0.04

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