Investments (Net Investment Income) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross Investment Income	$ 18,577	$ 17,082	$ 17,198
Less: investment expenses	(992)	(906)	(763)
Net investment income	17,585	16,176	16,435
Assets supporting experience-rated contractholder liabilities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross Investment Income	731	722	736
Equity securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross Investment Income	160	164	398
Commercial mortgage and other loans
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross Investment Income	2,584	2,352	2,267
Policy loans
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross Investment Income	619	622	617
Other invested assets
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross Investment Income	1,005	519	1,117
Short-term investments and cash equivalents
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross Investment Income	453	345	203
Available-for-sale \| Fixed Maturities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross Investment Income	12,644	11,989	11,482
Held-to-maturity \| Fixed Maturities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross Investment Income	232	226	215
Trading \| Fixed Maturities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross Investment Income	$ 149	$ 143	$ 163

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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