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Insurance Contracts - Summary of Loss Reserve Roll-Forward, Net of Subrogation Recoverable and Reinsurance (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |  |
Impact of VIE Consolidation on Gross Loss and Loss Reserves | $ (292) | $ 0 |  |
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |  |
Beginning balance of net loss and loss expense reserves | (578) | (430) |  |
Current Year Claims and Claims Adjustment Expense | 1 | 0 |  |
Prior Year Claims and Claims Adjustment Expense | 23 | 8 |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims | 24 | 8 |  |
Claim and loss expense payments, net of subrogation and reinsurance | 0 | 0 |  |
Claim and loss expense (payments) recoveries, net of subrogation and reinsurance | 150 | (25) |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid | (150) | 25 |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Foreign Currency Translation Gain (Loss) | (1) | 0 |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Net | (404) | (447) | $ (578) | $ (430)
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 49 | 33 | 55 | 33
Policyholder Benefits and Claims Incurred, Ceded | 7 | 1 |  |
Net Incurred RMBS Subrogation Recoveries | (224) | (3) |  |
Ceded Loss And Loss Expenses Paid Not Yet Recovered |  | 0 |  |
Liability for Claim and Claim Adjustment Expenses Net of Subrogation recoverables | $ (647) | $ (414) | (522) | $ (397)
Financial Guarantee |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |  |
Ceded Loss And Loss Expenses Paid Not Yet Recovered |  |  | 0 |
Loss Reserves Ceded To Reinsurers |  |  | $ 24 |

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