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Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	$ 104,174	$ 94,295
Gross unrealized gains	19,081	11,086
Gross unrealized losses	198	240
Allowance for Credit Losses	13	0
OTTI		(59)
Fair Value	123,044	105,200
Fixed Maturity AFS Securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	104,174
Allowance for Credit Losses	13
Fair Value	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	86,289	79,417
Gross unrealized gains	16,662	9,479
Gross unrealized losses	150	184
Allowance for Credit Losses	12
OTTI		(4)
Fair Value	102,789	88,716
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	397	384
Gross unrealized gains	88	51
Gross unrealized losses	1
Fair Value	484	435
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	5,360	4,778
Gross unrealized gains	1,561	1,113
Gross unrealized losses		7
Fair Value	6,921	5,884
Fixed Maturity AFS Securities [Member] | Foreign Government Bonds [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	384	329
Gross unrealized gains	87	64
Gross unrealized losses	1
Fair Value	470	393
Fixed Maturity AFS Securities [Member] | RMBS [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	2,765	3,042
Gross unrealized gains	313	190
Gross unrealized losses	1	10
Allowance for Credit Losses	1
OTTI		(19)
Fair Value	3,076	3,241
Fixed Maturity AFS Securities [Member] | CMBS [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	1,390	1,038
Gross unrealized gains	115	45
Gross unrealized losses		1
OTTI		(1)
Fair Value	1,505	1,083
Fixed Maturity AFS Securities [Member] | ABS [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	7,041	4,810
Gross unrealized gains	158	62
Gross unrealized losses	15	18
OTTI		(35)
Fair Value	7,184	4,889
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	548	497
Gross unrealized gains	97	82
Gross unrealized losses	30	20
Fair Value	$ 615	$ 559

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