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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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-Section 50
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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
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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	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	$ 111,354		$ 111,707
Gross unrealized gains	1,201		1,069
Gross unrealized losses	11,640		13,018
Allowance for Credit Losses	25	$ 39	22	$ 12	$ 20	$ 19
Fair Value	100,890		99,736
Corporate Bonds [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	88,334		89,249
Gross unrealized gains	874		787
Gross unrealized losses	9,888		11,004
Allowance for Credit Losses	13	27	9	7	16	17
Fair Value	79,307		79,023
U.S. Government Bonds [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	396		405
Gross unrealized gains	5		5
Gross unrealized losses	30		31
Fair Value	371		379
State And Municipal Bonds [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	5,268		5,410
Gross unrealized gains	218		172
Gross unrealized losses	412		512
Fair Value	5,074		5,070
Foreign Government Bonds [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	312		348
Gross unrealized gains	15		17
Gross unrealized losses	46		47
Fair Value	281		318
RMBS [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	2,205		2,216
Gross unrealized gains	22		22
Gross unrealized losses	206		222
Allowance for Credit Losses	6	$ 6	7	$ 3	$ 2	$ 1
Fair Value	2,015		2,009
CMBS [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	1,915		1,917
Gross unrealized gains	1		3
Gross unrealized losses	232		246
Fair Value	1,684		1,674
ABS [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	12,562		11,797
Gross unrealized gains	40		38
Gross unrealized losses	804		926
Allowance for Credit Losses	5		5
Fair Value	11,793		10,904
Hybrid And Redeemable Preferred Securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	362		365
Gross unrealized gains	26		25
Gross unrealized losses	22		30
Allowance for Credit Losses	1		1
Fair Value	$ 365		$ 359