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Investments (Net Investment Income) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Gross investment income | $ 4,551 | $ 4,428
Less: investment expenses | (169) | (226)
Net investment income | 4,382 | 4,202
Assets supporting experience-rated contractholder liabilities |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Gross investment income | 159 | 184
Equity securities |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Gross investment income | 23 | 28
Commercial mortgage and other loans |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Gross investment income | 617 | 640
Policy loans |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Gross investment income | 145 | 153
Other invested assets |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Gross investment income | 516 | 131
Short-term investments and cash equivalents |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Gross investment income | 10 | 87
Available-for-sale | Fixed maturities |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Gross investment income | 2,999 | 3,112
Held-to-maturity | Fixed maturities |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Gross investment income | 58 | 59
Trading | Fixed maturities |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Gross investment income | $ 24 | $ 34

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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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