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Basis of Presentation and Significant Accounting Policies Impact of Accounting Changes (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Jan. 01, 2021 | Jan. 01, 2020 | Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  |  |  |  |  | $ 4,215
Mortgage loans (net of ACL of $36 and $29) |  |  |  |  |  | 0
Financing Receivable, after Allowance for Credit Loss | $ 6,000 | $ 5,383 |  |  |  | 4,215
Premiums Receivable, Gross | 5,058 | 4,550 |  |  |  | 4,529
Premium Receivable, Allowance for Credit Loss | (109) | (105) | $ (152) |  |  | (145)
Premiums Receivable, Net | 4,949 | 4,445 |  |  |  | 4,384
Reinsurance Recoverables, Gross | 7,071 | 6,622 |  |  |  | 5,641
Allowance for uncollectible reinsurance | (105) | (99) | (108) |  |  | (114)
Reinsurance recoverables, net | 6,966 | 6,523 |  |  |  | 5,527
Deferred income taxes | 1,449 | 270 |  |  |  | 299
Other Liabilities | (4,757) | (5,655) |  |  |  | (5,157)
Retained Earnings (Accumulated Deficit) | 17,048 | 15,764 |  |  |  | 12,685
Reserve for future policy benefits | 561 | 596 | 638 |  |  |
Hosting Arrangement, Service Contract, Implementation Cost, Expense, Amortization | 78 | 60 | 42 |  |  |
Commercial Loan [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 6,036 | 5,412 |  |  |  |
Mortgage loans (net of ACL of $36 and $29) | (36) | (29) | (38) |  |  | 0
Financing Receivable, after Allowance for Credit Loss | 6,000 | 5,383 |  |  |  |
Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 300 |  |  |  |  |
Reinsurance Policy, Type [Axis]: Before Uncollectible Reinsurance [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Allowance for uncollectible reinsurance | (45) | (45) | (55) |  |  | (48)
Reinsurance Policy, Type [Axis]: Disputes [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Allowance for uncollectible reinsurance | (60) | (54) | (53) |  |  | (114)
Reinsurance Policy, Type [Axis]: Disputes [Members] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Allowance for uncollectible reinsurance |  | $ (54) | $ (53) |  |  | (66)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  | (2)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Commercial Loan [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Retained Earnings (Accumulated Deficit) |  |  |  |  | $ 19 |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2018-12 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Reserve for future policy benefits |  |  |  | $ 85 |  |
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  |  |  |  | 4,215 |
Mortgage loans (net of ACL of $36 and $29) |  |  |  |  | (19) |
Financing Receivable, after Allowance for Credit Loss |  |  |  |  | 4,196 |
Premiums Receivable, Gross |  |  |  |  | 4,529 |
Premium Receivable, Allowance for Credit Loss |  |  |  |  | (122) | (122)
Premiums Receivable, Net |  |  |  |  | 4,407 |
Reinsurance Recoverables, Gross |  |  |  |  | 5,641 |
Reinsurance recoverables, net |  |  |  |  | 5,525 |
Deferred income taxes |  |  |  |  | 304 |
Other Liabilities |  |  |  |  | (5,182) |
Retained Earnings (Accumulated Deficit) |  |  |  |  | 12,667 |
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commercial Loan [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Mortgage loans (net of ACL of $36 and $29) |  |  |  |  | (19) |
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Reinsurance Policy, Type [Axis]: Before Uncollectible Reinsurance [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Allowance for uncollectible reinsurance |  |  |  |  |  | $ (50)
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Reinsurance Policy, Type [Axis]: Disputes [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Allowance for uncollectible reinsurance |  |  |  |  | (116) |
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  | 18 |
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Reinsurance Recoverable Including Reinsurance Premium Paid [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  | (2) |
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Deferred Income Tax Asset, Net [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  | (5) |
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Other liabilities |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  | (25) |
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Total Change to LCL and ACL [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  | 23 |
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Premiums Receivable [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  | (23) |
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Commercial Loan [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  | $ (19) |
Accumulated Other Comprehensive Income (Loss), net of tax | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2018-12 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ (35) |  |  | $ 65 |  |

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