Investments (Credit Losses Recognized in Earnings on Fixed Maturity Securities Held by the Company) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Debt Securities, Available-for-Sale, Allowance for Credit Loss	$ 98	$ 75	$ 37
Financing Receivable, Allowance for Credit Loss, Loan Sold	30	10
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Not to Sell before Recovery, Credit Loss, Previously Recorded, Expense (Reversal)	4	(2)
Financing Receivable, Allowance for Credit Loss, Foreign Currency Translation	(1)	0
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Not Previously Recorded	56	52
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Writeoff	0	(6)
Corporate Debt Securities [Member]
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Debt Securities, Available-for-Sale, Allowance for Credit Loss	82	62	27
Financing Receivable, Allowance for Credit Loss, Loan Sold	30	10
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Not to Sell before Recovery, Credit Loss, Previously Recorded, Expense (Reversal)	7	0
Financing Receivable, Allowance for Credit Loss, Foreign Currency Translation	(1)	0
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Not Previously Recorded	56	51
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Writeoff	0	(6)
Asset-backed Securities [Member]
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Debt Securities, Available-for-Sale, Allowance for Credit Loss	15	12	10
Financing Receivable, Allowance for Credit Loss, Loan Sold	0	0
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Not to Sell before Recovery, Credit Loss, Previously Recorded, Expense (Reversal)	3	2
Financing Receivable, Allowance for Credit Loss, Foreign Currency Translation	0	0
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Not Previously Recorded	0	0
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Writeoff	0	0
Commercial Mortgage Backed Securities [Member]
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Debt Securities, Available-for-Sale, Allowance for Credit Loss	1	1	$ 0
Financing Receivable, Allowance for Credit Loss, Loan Sold	0	0
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Not to Sell before Recovery, Credit Loss, Previously Recorded, Expense (Reversal)	0	0
Financing Receivable, Allowance for Credit Loss, Foreign Currency Translation	0	0
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Not Previously Recorded	0	1
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Writeoff	$ 0	$ 0

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).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
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-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Amount of expense 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), for which no credit loss was previously recorded.

+ References

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

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of foreign currency translation gain (loss) which decreases (increases) allowance for credit loss on financing receivable. Excludes net investment in lease.

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