Investments (Schedule Of Fixed Maturities By Contractual Maturity) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Available for sale, Due in 1 year or less, Fair Value & Net Carrying Value	$ 2,962	$ 4,498
Available for sale, Due after 1 year through 5 years, Fair Value & Carrying Value	24,791	25,542
Available for sale, Due after 5 years through 10 years, Fair Value & Carrying Value	26,679	28,207
Available for sale, Due after 10 years, Fair Value & Carrying Value	14,937	14,372
Available for sale, Maturity, Allocated and Single Maturity Date, Fair Value	69,369	72,619
Available for sale, Maturity, Allocated and Single Maturity Date, Amortized Cost		72,619
Available for sale, Mortgage backed securities, Fair Value	15,851	20,489
Available for sale, Mortgage-backed securities, Amortized Cost		20,489
Available for sale, Fair Value	85,220	93,108
Held to maturity, Due in 1 year or less, net carrying value	1,015	888
Held to maturity, maturity, Due after 1 year through 5 years, net carrying value	3,658	3,744
Held to maturity, Due after 5 years through 10 years, net carrying value	1,460	2,242
Held to maturity, Due after 10 years, net carrying value	1,260	1,514
Held-to-maturity, maturity, allocated and single maturity date, net carrying value	7,393	8,388
Held-to-maturity, mortgage-backed securities, net carrying value	1,455	1,730
Debt securities, held to maturity, net carrying value	8,848	10,118
Held to maturity, Due in 1 year or less, Fair Value	1,003	894
Held to maturity, Due after 1 year through 5 years, Fair Value	3,531	3,846
Held to maturity, Due after 5 years through 10 years, Fair Value	1,423	2,349
Held to maturity, Due after 10 years, Fair Value	1,131	1,755
Held to maturity, Maturity, Allocated and Single Maturity Date, Fair Value	7,088	8,844
Held to maturity, Mortgage backed securities, Fair Value	1,351	1,803
Held to maturity, Fair Value	$ 8,439	$ 10,647