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Basis of Presentation and Significant Accounting Policies Impact of Accounting Changes (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  |  |  | $ 4,215 |  |  |
Financing Receivable, Allowance for Credit Loss |  |  |  | 0 |  |  |
Financing Receivable, after Allowance for Credit Loss |  |  |  | 4,215 |  |  |
Premiums Receivable, Gross | $ 4,624 |  |  | 4,529 |  |  |
Premium Receivable, Allowance for Credit Loss | (174) | $ (183) |  | (145) |  |  |
Premiums receivable and agents' balances, net of ACL | 4,450 |  |  | 4,384 |  |  |
Reinsurance Recoverables, Gross | 5,777 |  |  | 5,641 |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | (55) | (54) |  | (48) |  |  |
Reinsurance Recoverables, Including Reinsurance Premium Paid | 5,668 |  |  | 5,527 |  |  |
Deferred income taxes, net | 49 |  |  | 299 |  |  |
Other Liabilities | (4,585) |  |  | (5,157) |  |  |
Retained earnings | 13,503 |  |  | 12,685 |  |  |
Commercial Loan [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 4,499 |  |  | 4,215 |  |  |
Financing Receivable, Allowance for Credit Loss | (38) | (43) |  | 0 | $ 0 | $ 0 | $ (1)
Uncollectible reinsurance |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | $ (109) | (111) |  | (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 |  | 0 |  | (2) |  |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial Loan [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Retained earnings |  |  | $ (19) |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings | 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 |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings | Reinsurance Recoverable Including Reinsurance Premium Paid [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] | Retained Earnings | Deferred Income Tax Asset, Net [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 |  |  | (5) |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings | Other liabilities | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  | (25) |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings | Total Change to LCL and ACL [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 |  |  | 23 |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings | Premiums Receivable [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 |  |  | (23) |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings | Commercial Loan [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 |  |  | (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 |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  | (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 and agents' balances, net of ACL |  |  | 4,407 |  |  |  |
Reinsurance Recoverables, Gross |  |  | 5,641 |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss |  | (54) |  | $ (50) |  |  |
Reinsurance Recoverables, Including Reinsurance Premium Paid |  |  | 5,525 |  |  |  |
Deferred income taxes, net |  |  | 304 |  |  |  |
Other Liabilities |  |  | (5,182) |  |  |  |
Retained earnings |  |  | 12,667 |  |  |  |
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commercial Loan [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  | $ 43 | (19) |  |  |  |
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Uncollectible reinsurance |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss |  |  | $ (116) |  |  |  |

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