Investments (Variable Interest Entities) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Carrying amount	$ 224,301	$ 216,153
VIE, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Carrying amount	14,841	14,851
Maximum exposure to loss	15,255	15,382
VIE, Not Primary Beneficiary | Fixed maturity securities
Variable Interest Entity [Line Items]
Carrying amount	12,973	12,959
Maximum exposure to loss	12,098	12,317
VIE, Not Primary Beneficiary | Limited partnerships and LLCs
Variable Interest Entity [Line Items]
Carrying amount	1,868	1,892
Maximum exposure to loss	$ 3,157	$ 3,065