Variable Interest Entities (Narrative) (Details) - USD ($)		Dec. 31, 2019	Dec. 31, 2018
Variable Interest Entity [Line Items]
Other Investments	[1]	$ 15,606,000,000	$ 14,526,000,000
Joint ventures and limited partnerships
Variable Interest Entity [Line Items]
Other Investments		11,157,000,000	9,841,000,000
Variable Interest Entity, Not Primary Beneficiary, Aggregated Disclosure
Variable Interest Entity [Line Items]
Liabilities held within unconsolidated VIEs		0
Variable Interest Entity, Not Primary Beneficiary, Aggregated Disclosure | Fixed maturities, available-for-sale, Fixed maturities, trading, Equity securities and Other invested assets
Variable Interest Entity [Line Items]
Maximum exposure to loss resulting from investment in unconsolidated VIEs		1,021,000,000	836,000,000
VIEs and Non-VIEs | Joint ventures and limited partnerships
Variable Interest Entity [Line Items]
Other Investments		$ 11,157,000,000	$ 9,841,000,000

[1] See Note 4 for details of balances associated with variable interest entities.