Investments (Net Investment Income) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 4,852	$ 4,619	$ 14,133	$ 13,405
Less: investment expenses	(135)	(173)	(482)	(571)
Net investment income	4,717	4,446	13,651	12,834
Assets supporting experience-rated contractholder liabilities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	148	179	474	527
Equity securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	23	36	104	119
Commercial mortgage and other loans
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	621	608	1,882	1,866
Policy loans
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	132	147	403	450
Other invested assets
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	806	415	1,939	693
Short-term investments and cash equivalents
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	18	30	48	182
Available-for-sale \| Fixed maturities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	2,995	3,113	9,000	9,292
Held-to-maturity \| Fixed maturities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	56	59	169	176
Trading \| Fixed maturities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 53	$ 32	$ 114	$ 100

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.

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