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Investments (Schedule Of Amortized Cost And Fair Value Of Held-to-Maturity Fixed Maturities) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held to maturity, Allowance for Credit Loss	$ 0	$ 0	$ 34	$ 33	$ 34	$ 35
Debt securities, held to maturity, net carrying value	0		8,848
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain			3
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss			(412)
Held to maturity, Fair Value	$ 0		8,439
U.S. Treasury / Agency
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held to maturity, Allowance for Credit Loss			0
Debt securities, held to maturity, net carrying value			1,417
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain			1
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss			(48)
Held to maturity, Fair Value			1,370
Non-U.S.
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held to maturity, Allowance for Credit Loss			4
Debt securities, held to maturity, net carrying value			1,136
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain			0
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss			(82)
Held to maturity, Fair Value			1,054
Corporate and asset-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held to maturity, Allowance for Credit Loss			28
Debt securities, held to maturity, net carrying value			1,705
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain			1
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss			(126)
Held to maturity, Fair Value			1,580
Mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held to maturity, Allowance for Credit Loss			1
Debt securities, held to maturity, net carrying value			1,455
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain			0
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss			(104)
Held to maturity, Fair Value			1,351
Municipal
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held to maturity, Allowance for Credit Loss			1
Debt securities, held to maturity, net carrying value			3,135
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain			1
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss			(52)
Held to maturity, Fair Value			$ 3,084

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