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Investments (Net Investment Income) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Investment income | $ 5,454 | $ 5,271 | $ 5,169
Investment expense | (231) | (186) | (179)
Net investment income | 5,223 | 5,085 | 4,990
Fixed Maturity AFS Securities [Member] | AFS Securities [Member] |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Investment income | 4,281 | 4,209 | 4,163
Equity AFS Securities [Member] |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Investment income |  |  | 12
Trading Securities [Member] |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Investment income | 191 | 84 | 94
Equity Securities [Member] |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Investment income | 4 | 4 |
Mortgage Loans On Real Estate [Member] |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Investment income | 629 | 496 | 440
Real estate [Member] |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Investment income | 1 | 1 | 2
Policy loans [Member] |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Investment income | 129 | 123 | 135
Invested Cash [Member] |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Investment income | 40 | 26 | 11
Commercial mortgage loan prepayment and bond makewhole premiums [Member] |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Investment income | 119 | 79 | 139
Alternative investments [Member] |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Investment income | 22 | 222 | 165
Consent fees [Member] |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Investment income | 8 | 4 | 6
Other Investments [Member] |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Investment income | $ 30 | $ 23 | $ 2

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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=116637232&loc=SL114874131-224263 + Details
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