Investments (Variable Interest Entities) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Carrying amount	$ 235,288	$ 216,153
VIE, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Carrying amount	15,801	14,851
Maximum exposure to loss	15,981	15,382
VIE, Not Primary Beneficiary | Fixed maturity securities
Variable Interest Entity [Line Items]
Carrying amount	13,494	12,959
Maximum exposure to loss	12,416	12,317
VIE, Not Primary Beneficiary | Limited partnerships and LLCs
Variable Interest Entity [Line Items]
Carrying amount	2,307	1,892
Maximum exposure to loss	$ 3,565	$ 3,065