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Investments (Investment Income Net of Related Expenses) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Major Categories Of Investment Income Net Of Expenses [Line Items] |  |  |
Gross Investment Income, Operating | $ 2,667 | $ 2,616 | $ 2,229
Investment Income, Investment Expense | (92) | (96) | (90)
Investment income, net of related expenses | 2,575 | 2,520 | 2,139
Available-for-sale Securities [Member] |  |  |
Major Categories Of Investment Income Net Of Expenses [Line Items] |  |  |
Gross Investment Income, Operating | 1,928 | 1,786 | 1,529
Equity Securities [Member] |  |  |
Major Categories Of Investment Income Net Of Expenses [Line Items] |  |  |
Gross Investment Income, Operating | 6 | 8 | 4
Mortgage Loans on Real Estate [Member] |  |  |
Major Categories Of Investment Income Net Of Expenses [Line Items] |  |  |
Gross Investment Income, Operating | 282 | 255 | 214
Policy Loans [Member] |  |  |
Major Categories Of Investment Income Net Of Expenses [Line Items] |  |  |
Gross Investment Income, Operating | 56 | 58 | 59
Funds Withheld At Interest [Member] |  |  |
Major Categories Of Investment Income Net Of Expenses [Line Items] |  |  |
Gross Investment Income, Operating | 279 | 297 | 310
Short-term Investments [Member] |  |  |
Major Categories Of Investment Income Net Of Expenses [Line Items] |  |  |
Gross Investment Income, Operating | 7 | 28 | 14
Other Aggregated Investments [Member] |  |  |
Major Categories Of Investment Income Net Of Expenses [Line Items] |  |  |
Gross Investment Income, Operating | $ 109 | $ 184 | $ 99

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- Definition Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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