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Investments (Rollforward of expected credit-losses, AFS) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Debt Securities, Available for sale, Allowance for Credit Loss	$ 158	$ 147	$ 158	$ 147	$ 193	$ 169	$ 78	$ 14
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease)	34	91	172	169
Debt Securities, Available-for-sale, Allowance for Credit Loss, Writeoff	(1)	0	(5)	0
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Foreign Currency Revaluation	0	(2)	0	(2)
Debt Securities, Available-for-sale, Allowance for Credit Loss, Recovery	$ (68)	$ (20)	$ (178)	$ (34)

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- Definition

Debt Securities, Available-for-Sale, Allowance for Credit Loss, Foreign Currency Revaluation

+ References

No definition available.

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- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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Amount of increase (decrease) in allowance for credit loss 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/2009/role/commonPracticeRef
-Topic 326
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Amount of increase in 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), from recovery.

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Amount of writeoff 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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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