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Investments (Realized Investment Gains Losses, Net) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Gain (Loss) on Securities [Line Items] |  |
Realized investment gains (losses), net | $ 2,079 | $ 1,667
Fixed maturities |  |
Gain (Loss) on Securities [Line Items] |  |
Realized investment gains (losses), net | 1,216 | 158
Commercial mortgage and other loans |  |
Gain (Loss) on Securities [Line Items] |  |
Realized investment gains (losses), net | 30 | 22
Investment real estate |  |
Gain (Loss) on Securities [Line Items] |  |
Realized investment gains (losses), net | 52 | (1)
LPs/LLCs |  |
Gain (Loss) on Securities [Line Items] |  |
Realized investment gains (losses), net | 0 | (3)
Derivatives |  |
Gain (Loss) on Securities [Line Items] |  |
Realized investment gains (losses), net | 775 | 1,492
Other |  |
Gain (Loss) on Securities [Line Items] |  |
Realized investment gains (losses), net | $ 6 | $ (1)

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- Definition Amount of realized gain (loss) on investment. + 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 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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