Investments (Schedule Of Fixed Maturities By Contractual Maturity) (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Available for sale, Due in 1 year or less, Fair Value & Net Carrying Value	$ 4,355	$ 2,962
Available for sale, Due after 1 year through 5 years, Fair Value & Net Carrying Value	30,067	24,791
Available for sale, Due after 5 years through 10 years, Fair Value & Net Carrying Value	28,491	26,679
Available for sale, Due after 10 years, Fair Value & Net Carrying Value	15,904	14,937
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	78,817	69,369
Available for sale, Mortgage backed securities, Fair Value & Net Carrying Value	17,972	15,851
Available for sale, Fair Value	96,789	85,220
Debt securities, Held-to-maturity, maturity, allocated and single maturity date, within one year, net carrying value	0	1,015
Held to maturity, Due in 1 year or less, Fair Value	0	1,003
Held-to-maturity, after one through five years, net carrying value	0	3,658
Held to maturity, Due after 1 year through 5, Fair Value	0	3,531
Held-to-maturity, after 5 through 10 years, net carrying value	0	1,460
Held to maturity, Due after 5 years through 10 years, Fair Value	0	1,423
Held-to-maturity, after 10 years, net carrying value	0	1,260
Held to maturity, Due after 10 years, Fair Value	0	1,131
Debt securities, Held-to-maturity, maturity, allocated and single maturity date, net carrying value	0	7,393
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value	0	7,088
Held-to-maturity, MBS, net carrying value	0	1,455
Held to maturity, Mortgage backed securities, Fair Value	0	1,351
Debt securities, held to maturity, net carrying value	0	8,848
Held to maturity, Fair Value	$ 0	$ 8,439