Variable Interest Entities (Narrative) (Details) - USD ($)		Sep. 30, 2019	Dec. 31, 2018
Variable Interest Entity [Line Items]
Other invested assets	[1]	$ 15,654,000,000	$ 14,526,000,000
Other Unconsolidated VIEs
Variable Interest Entity [Line Items]
Liabilities held within unconsolidated VIEs		0
Other Unconsolidated VIEs | Fixed maturities, available-for-sale, Fixed maturities, trading, Equity securities and Other invested assets [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss resulting from investment in unconsolidated VIEs		960,000,000	836,000,000
LPs/LLCs
Variable Interest Entity [Line Items]
Other invested assets		10,742,000,000	9,841,000,000
LPs/LLCs | VIEs and Non-VIEs
Variable Interest Entity [Line Items]
Other invested assets		$ 10,742,000,000	$ 9,841,000,000

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