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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

X

- 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.

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-Topic 944
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-Paragraph 1
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Amount of expenses related to the generation of investment income.

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Amount, after 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

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