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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	$ 107,459		$ 104,174
Allowance for Credit Losses	17		13
Fair Value	122,085		123,044
Fixed Maturity AFS Securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	107,459		104,174
Gross unrealized gains	15,043		19,081
Gross unrealized losses	400		198
Allowance for Credit Losses	17	$ 9	13	$ 12	$ 22
Fair Value	122,085		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	88,238		86,289
Gross unrealized gains	12,964		16,662
Gross unrealized losses	324		150
Allowance for Credit Losses	16	8	12	11	20
Fair Value	100,862		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	385		397
Gross unrealized gains	60		88
Gross unrealized losses	2		1
Fair Value	443		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	5,543		5,360
Gross unrealized gains	1,369		1,561
Gross unrealized losses	11
Fair Value	6,901		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	455		384
Gross unrealized gains	64		87
Gross unrealized losses	7		1
Fair Value	512		470
Fixed Maturity AFS Securities [Member] \| RMBS [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	2,687		2,765
Gross unrealized gains	252		313
Gross unrealized losses	3		1
Allowance for Credit Losses	1	$ 1	1	$ 1	1
Fair Value	2,935		3,076
Fixed Maturity AFS Securities [Member] \| CMBS [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	1,528		1,390
Gross unrealized gains	76		115
Gross unrealized losses	10
Fair Value	1,594		1,505
Fixed Maturity AFS Securities [Member] \| ABS [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	8,186		7,041
Gross unrealized gains	148		158
Gross unrealized losses	31		15
Allowance for Credit Losses					$ 1
Fair Value	8,303		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	437		548
Gross unrealized gains	110		97
Gross unrealized losses	12		30
Fair Value	$ 535		$ 615