Investments (Net Investment Income) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 4,769	$ 4,113	$ 9,377	$ 8,644
Less: investment Expense	(293)	(175)	(581)	(348)
Net investment income	4,476	3,938	8,796	8,296
Assets supporting experience-rated contractholder liabilities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	12	9	25	144
Equity securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	64	50	104	76
Commercial mortgage and other loans
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	560	525	1,103	1,113
Policy loans
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	124	126	248	251
Other invested assets
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	384	377	694	932
Short-term investments and cash equivalents
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	222	58	460	75
Available-for-sale \| Fixed maturities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	3,296	2,861	6,531	5,830
Held-to-maturity \| Fixed maturities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	50	54	100	108
Trading \| Fixed maturities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 57	$ 53	$ 112	$ 115

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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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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