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Basis of Presentation and Significant Accounting Policies Impact of Accounting Changes (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | $ 4,215 | $ 4,215 |  |
Adjusted beginning balance |  | (19) | 0 |  |
Financing Receivable, after Allowance for Credit Loss |  | 4,196 | 4,215 |  |
Premiums Receivable, Gross | $ 4,697 | 4,529 | 4,529 |  |
Premium Receivable, Allowance for Credit Loss | (139) | (122) | (145) |  |
Premiums receivable and agents' balances (net of ACL of {$104} and $145) | 4,558 | 4,407 | 4,384 |  |
Reinsurance Recoverables, Gross | 5,713 |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | (52) | (50) | (48) |  |
Reinsurance Recoverables, Including Reinsurance Premium Paid | 5,596 |  | 5,527 |  |
Deferred income taxes, net | 502 | 304 | 299 |  |
Other Liabilities | (4,330) | (5,182) | (5,157) |  |
Retained Earnings (Accumulated Deficit) | 12,819 | 12,667 | 12,685 |  |
Accounting Standards Update 2016-13 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | 2 |  |  |
Premiums Receivable [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | 0 |  |  |
Premiums Receivable, ACL [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | (23) |  |  |
Reinsurance Recoverable Including Reinsurance Premium Paid, ACL [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | 2 |  |  |
Deferred Income Tax Asset, Net [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | (5) |  |  |
Other liabilities | Accounting Standards Update 2016-13 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | 25 |  |  |
Total Change to LCL and ACL [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | 23 |  |  |
Retained Earnings |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  | $ 0
Retained Earnings | Accounting Standards Update 2016-13 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | 18 |  |  |
Commercial Loan [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 4,374 |  | 4,215 |  |
Adjusted beginning balance | (21) |  | 0 | $ (1) | $ (1)
Commercial Loan [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | 0 |  |  |
Commercial Loan, ACL [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Adjusted beginning balance |  | (19) |  |  |
Commercial Loan, ACL [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | (19) |  |  |
Uncollectible Reinsurance [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Reinsurance Recoverables, Gross |  | 5,641 | 5,641 |  |
Reinsurance Recoverable, Allowance for Credit Loss | $ (117) | (116) | (114) |  |
Reinsurance Recoverables, Including Reinsurance Premium Paid |  | 5,525 | $ 5,527 |  |
Uncollectible Reinsurance [Member] | Reinsurance Recoverable Including Reinsurance Premium Paid [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | 0 |  |  |
Uncollectible Reinsurance [Member] | Reinsurance Recoverable Including Reinsurance Premium Paid, ACL [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | $ 2 |  |  |

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