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Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	$ 106,668		$ 104,174
Allowance for Credit Losses	9		13
Fair Value	122,215		123,044
Fixed Maturity AFS Securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	106,668		104,174
Gross unrealized gains	15,884		19,081
Gross unrealized losses	328		198
Allowance for Credit Losses	9	$ 14	13	$ 22	$ 20
Fair Value	122,215		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	87,573		86,289
Gross unrealized gains	13,710		16,662
Gross unrealized losses	272		150
Allowance for Credit Losses	8	13	12	20	$ 20
Fair Value	101,003		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	383		397
Gross unrealized gains	63		88
Gross unrealized losses	2		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	5,513		5,360
Gross unrealized gains	1,413		1,561
Gross unrealized losses	7
Fair Value	6,919		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	400		384
Gross unrealized gains	67		87
Gross unrealized losses	3		1
Fair Value	464		470
Fixed Maturity AFS Securities [Member] | RMBS [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	2,751		2,765
Gross unrealized gains	278		313
Gross unrealized losses	1		1
Allowance for Credit Losses	1	$ 1	1	1
Fair Value	3,027		3,076
Fixed Maturity AFS Securities [Member] | CMBS [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	1,499		1,390
Gross unrealized gains	86		115
Gross unrealized losses	7
Fair Value	1,578		1,505
Fixed Maturity AFS Securities [Member] | ABS [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	8,039		7,041
Gross unrealized gains	160		158
Gross unrealized losses	22		15
Allowance for Credit Losses				$ 1
Fair Value	8,177		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	510		548
Gross unrealized gains	107		97
Gross unrealized losses	14		30
Fair Value	$ 603		$ 615

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