Investments (Schedule Of Amortized Cost And Fair Value Of Held-to-Maturity Fixed Maturities) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity		$ 8,882
Debt Securities, Held-to-maturity, Allowance for Credit Loss	$ 0	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		1,417
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		1,140
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		1,733
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		1,456
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		3,136
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