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

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	$ 112,034		$ 111,707
Gross Unrealized Gains	606		1,069
Gross Unrealized Losses	14,815		13,018
Allowance for Credit Losses	21	$ 25	22	$ 18	$ 12	$ 19
Fair Value	97,804		99,736
Corporate Bonds [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	88,326		89,249
Gross Unrealized Gains	447		787
Gross Unrealized Losses	12,763		11,004
Allowance for Credit Losses	9	13	9	7	7	17
Fair Value	76,001		79,023
U.S. Government Bonds [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	418		405
Gross Unrealized Gains	3		5
Gross Unrealized Losses	48		31
Fair Value	373		379
State And Municipal Bonds [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	5,247		5,410
Gross Unrealized Gains	67		172
Gross Unrealized Losses	544		512
Fair Value	4,770		5,070
Foreign Government Bonds [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	326		348
Gross Unrealized Gains	9		17
Gross Unrealized Losses	62		47
Fair Value	273		318
RMBS [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	2,192		2,216
Gross Unrealized Gains	18		22
Gross Unrealized Losses	276		222
Allowance for Credit Losses	6	$ 6	7	$ 5	$ 3	$ 1
Fair Value	1,928		2,009
CMBS [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	1,963		1,917
Gross Unrealized Gains			3
Gross Unrealized Losses	262		246
Fair Value	1,701		1,674
ABS [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	13,201		11,797
Gross Unrealized Gains	37		38
Gross Unrealized Losses	840		926
Allowance for Credit Losses	5		5
Fair Value	12,393		10,904
Hybrid And Redeemable Preferred Securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	361		365
Gross Unrealized Gains	25		25
Gross Unrealized Losses	20		30
Allowance for Credit Losses	1		1
Fair Value	$ 365		$ 359