Investments (Variable Interest Entities) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Carrying amount	$ 239,681	$ 227,259
VIE, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Carrying amount	15,529	15,001
Maximum exposure to loss	15,744	15,534
VIE, Not Primary Beneficiary | Fixed maturity securities
Variable Interest Entity [Line Items]
Carrying amount	13,446	13,094
Maximum exposure to loss	12,393	12,454
VIE, Not Primary Beneficiary | Limited partnerships and LLCs
Variable Interest Entity [Line Items]
Carrying amount	2,083	1,907
Maximum exposure to loss	$ 3,351	$ 3,080