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Summary of Significant Accounting Policies - Allowance For Credit Loss (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Investments | $ 142 | $ 103 |
Premium installment receivables | 153 | 91 | $ 91
Reinsurance recoverables | 74 | 74 |
Other assets | 23 | 18 |
Assets | 392 | 286 |
Commitments to fund mortgage loans, bank loans and agent loans | 1 | 3 |
Liabilities | 1 | 3 |
Total | 393 | 289 |
Fixed income securities |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Fixed income securities | 3 | 0 | 0
Mortgage loans |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Allowance credit losses | 67 | 45 | $ 3
Bank loans |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Allowance credit losses | 67 | 53 |
Agent loans |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Allowance credit losses | $ 5 | $ 5 |

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- Definition Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922900-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922900-210455 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 + Details
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- Definition Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121611286&loc=d3e11927-110247 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82919202-210446 + Details
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