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Fair Value Measurement - Quantitative Information about Level 3 Fair Value Measurements (Details) $ in Millions | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
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Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 79,117 | $ 76,919
Recurring |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 79,117 | 76,919
Recurring | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 278 | 378
Retained interests in securitizations | 35 | 36
Net derivative assets (liabilities) | 58 | 5
Total RMBS |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 63,638 | 62,589
Total RMBS | Recurring |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 63,638 | 62,589
Total RMBS | Recurring | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 146 | 236
CMBS | Recurring |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 8,323 | 7,870
CMBS | Recurring | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 132 | $ 142
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 | 0.02 | 0.03
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 | 0.19 | 0.12
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 | 0.07 | 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 | 0.05 | 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 | 0.07 | 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
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 | 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 | 69 months | 43 months
Voluntary prepayment rate | Recurring | Level 3 | Discounted cash flows |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Retained interests, measurement input | 0.09 |
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
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
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 | 0.04
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 | 0.20
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 | 0.08
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 | 0.14 | 0.07
Default rate | Recurring | Level 3 | Discounted cash flows |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Retained interests, measurement input | 0.02 | 0.01
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 | 0.11
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 | 0.01 | 0.02
Loss severity | Recurring | Level 3 | Discounted cash flows | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Retained interests, measurement input | 0.53 | 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 | 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 | 0.58
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 | 0.04 | 0.04

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