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Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	$ 105,866	$ 104,174
Allowance for Credit Losses	14	13
Fair Value	117,313	123,044
Fixed Maturity AFS Securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	105,866	104,174
Gross unrealized gains	12,264	19,081
Gross unrealized losses	803	198
Allowance for Credit Losses	14	13	$ 20
Fair Value	117,313	123,044
Fixed Maturity AFS Securities [Member] | Corporate Bonds [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	86,879	86,289
Gross unrealized gains	10,397	16,662
Gross unrealized losses	693	150
Allowance for Credit Losses	13	12	$ 20
Fair Value	96,570	102,789
Fixed Maturity AFS Securities [Member] | U.S. Government Bonds [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	393	397
Gross unrealized gains	54	88
Gross unrealized losses	3	1
Fair Value	444	484
Fixed Maturity AFS Securities [Member] | State And Municipal Bonds [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	5,474	5,360
Gross unrealized gains	1,185	1,561
Gross unrealized losses	34
Fair Value	6,625	6,921
Fixed Maturity AFS Securities [Member] | Foreign Government Bonds [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	428	384
Gross unrealized gains	63	87
Gross unrealized losses	6	1
Fair Value	485	470
Fixed Maturity AFS Securities [Member] | RMBS [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	2,820	2,765
Gross unrealized gains	261	313
Gross unrealized losses	3	1
Allowance for Credit Losses	1	1
Fair Value	3,077	3,076
Fixed Maturity AFS Securities [Member] | CMBS [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	1,464	1,390
Gross unrealized gains	68	115
Gross unrealized losses	16
Fair Value	1,516	1,505
Fixed Maturity AFS Securities [Member] | ABS [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	7,880	7,041
Gross unrealized gains	143	158
Gross unrealized losses	27	15
Allowance for Credit Losses
Fair Value	7,996	7,184
Fixed Maturity AFS Securities [Member] | Hybrid And Redeemable Preferred Securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	528	548
Gross unrealized gains	93	97
Gross unrealized losses	21	30
Fair Value	$ 600	$ 615

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