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Basis of Presentation and Significant Accounting Policies Impact of Accounting Changes (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | ---
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 $29 and $38) |  |  |  | 0 |
Financing Receivable, after Allowance for Credit Loss |  |  |  | 4,215 |
Premiums Receivable, Gross | $ 4,550 | $ 4,420 |  | 4,529 |
Premium Receivable, Allowance for Credit Loss | (105) | (152) |  | (145) |
Premiums Receivable, Net | 4,445 | 4,268 |  | 4,384 |
Reinsurance Recoverables, Gross | 6,622 | 6,119 |  | 5,641 |
Allowance for uncollectible reinsurance | (45) | (55) |  | (48) |
Reinsurance recoverables, net | 6,523 | 6,011 |  | 5,527 |
Deferred income taxes | 270 | 46 |  | 299 |
Other Liabilities | (5,655) | (5,222) |  | (5,157) |
Retained Earnings (Accumulated Deficit) | 15,764 | 13,918 |  | 12,685 |
Commercial Loan [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 5,412 | 4,531 |  |  |
Mortgage loans (net of ACL of $29 and $38) | (29) | (38) |  | 0 | $ (1)
Financing Receivable, after Allowance for Credit Loss | 5,383 | 4,493 |  |  |
Uncollectible reinsurance |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for uncollectible reinsurance | $ (99) | $ (108) |  | (114) |
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, 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 $29 and $38) |  |  | (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 |  |
Allowance for uncollectible reinsurance |  |  |  | $ (50) |
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 $29 and $38) |  |  | (19) |  |
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Uncollectible reinsurance |  |  |  |  |
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) |  |

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