Investments (Schedule Of Fixed Maturities By Contractual Maturity) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Available for sale, Due in 1 year or less, Fair Value & Net Carrying Value	$ 4,729	$ 2,962
Available for sale, Due after 1 year through 5 years, Fair Value & Carrying Value	33,573	24,791
Available for sale, Due after 5 years through 10 years, Fair Value & Carrying Value	28,480	26,679
Available for sale, Due after 10 years, Fair Value & Carrying Value	17,731	14,937
Available for sale, Maturity, Allocated and Single Maturity Date, Fair Value	84,513	69,369
Available for sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	84,513	69,369
Available for sale, Mortgage backed securities, Fair Value	22,058	15,851
Available for sale, Mortgage-backed securities, Amortized Cost	22,058	15,851
Available for sale, Fair Value	106,571	85,220
Held to maturity, Due in 1 year or less, net carrying value	0	1,015
Held to maturity, maturity, Due after 1 year through 5 years, net carrying value	0	3,658
Held to maturity, Due after 5 years through 10 years, net carrying value	0	1,460
Held to maturity, Due after 10 years, net carrying value	0	1,260
Held-to-maturity, maturity, allocated and single maturity date, net carrying value	0	7,393
Held-to-maturity, mortgage-backed securities, net carrying value	0	1,455
Debt securities, held to maturity, net carrying value	0	8,848
Held to maturity, Due in 1 year or less, Fair Value	0	1,003
Held to maturity, Due after 1 year through 5 years, Fair Value	0	3,531
Held to maturity, Due after 5 years through 10 years, Fair Value	0	1,423
Held to maturity, Due after 10 years, Fair Value	0	1,131
Held to maturity, Maturity, Allocated and Single Maturity Date, Fair Value	0	7,088
Held to maturity, Mortgage backed securities, Fair Value	0	1,351
Held to maturity, Fair Value	$ 0	$ 8,439