Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2024 |
Mar. 31, 2023 |
|
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | ||
| Transfers into Level 3 at end of reporting period, net gains (losses) not included in realized and unrealized gains and losses related to Level 3 for the period | $ (8) | $ 7 |
| Transfers out Level 3 at end of reporting period, net gains (losses) included in realized and unrealized gains and losses related to Level 3 for the period. | $ 4 | $ 11 |
| Average original expected lives (in years) | 10 years | |
| Minimum | ||
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | ||
| Extension period (in years) | 1 year | |
| Maximum | ||
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | ||
| Extension period (in years) | 2 years | |