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Insurance Contracts - Summary of Loss Reserve Roll-Forward, Net of Subrogation Recoverable and Reinsurance (Details) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 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 | 3 | 0 |  |
Prior Year Claims and Claims Adjustment Expense | 9 | (18) |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims | 12 | (18) |  |
Claim and loss expense payments, net of subrogation and reinsurance | 0 | 0 |  |
Claim and loss expense (payments) recoveries, net of subrogation and reinsurance | 158 | (38) |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid | (157) | 38 |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Foreign Currency Translation Gain (Loss) | (2) | 0 |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Net | (410) | (486) | $ (578) | $ (430)
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 55 | 30 | 55 | 33
Policyholder Benefits and Claims Incurred, Ceded | 14 | (2) |  |
Net Incurred RMBS Subrogation Recoveries | (242) | (10) |  |
Ceded Loss And Loss Expenses Paid Not Yet Recovered |  | 1 |  |
Liability for Claim and Claim Adjustment Expenses Net of Subrogation recoverables | (647) | $ (456) | (522) | $ (397)
Financial Guarantee |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |  |
Ceded Loss And Loss Expenses Paid Not Yet Recovered | 0 |  | 0 |
Loss Reserves Ceded To Reinsurers | $ 14 |  | $ 24 |

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