Investments (Schedule Of Amortized Cost And Fair Value Of Held-to-Maturity Fixed Maturities) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	$ 8,882	$ 10,153
Debt Securities, Held-to-maturity, Allowance for Credit Loss	34	35	$ 44
Debt securities, held to maturity, net carrying value	8,848	10,118
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	3	533
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(412)	(4)
Held to maturity, Fair Value	8,439	10,647
U.S. Treasury / Agency
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	1,417	1,213
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0	0
Debt securities, held to maturity, net carrying value	1,417	1,213
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	1	34
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(48)	(3)
Held to maturity, Fair Value	1,370	1,244
Non-U.S.
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	1,140	1,201
Debt Securities, Held-to-maturity, Allowance for Credit Loss	4	5
Debt securities, held to maturity, net carrying value	1,136	1,196
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	66
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(82)	0
Held to maturity, Fair Value	1,054	1,262
Corporate and asset-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	1,733	2,032
Debt Securities, Held-to-maturity, Allowance for Credit Loss	28	28
Debt securities, held to maturity, net carrying value	1,705	2,004
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	1	197
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(126)	0
Held to maturity, Fair Value	1,580	2,201
Mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	1,456	1,731
Debt Securities, Held-to-maturity, Allowance for Credit Loss	1	1
Debt securities, held to maturity, net carrying value	1,455	1,730
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	74
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(104)	(1)
Held to maturity, Fair Value	1,351	1,803
Municipal
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	3,136	3,976
Debt Securities, Held-to-maturity, Allowance for Credit Loss	1	1
Debt securities, held to maturity, net carrying value	3,135	3,975
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	1	162
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(52)	0
Held to maturity, Fair Value	$ 3,084	$ 4,137