Derivative Instruments (Schedule Of Offsetting Assets And Liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Financial Assets
Derivative Instruments, Gross amount of recognized assets	$ 7,708	$ 6,604
Derivative Instruments, Gross amounts offset	(3,703)	(3,010)
Derivative Instruments, Net amount of assets	4,005	3,594
Derivative Instruments, Cash collateral	(3,538)	(3,273)
Derivative Instruments, Non-cash collateral	(467)	(321)
Derivative Instruments, Net amount
Embedded Derivative Instruments, Gross amount of recognized assets	672	941
Embedded Derivative Instruments, Gross amounts offset
Embedded Derivative Instruments, Net amount of assets	672	941
Embedded Derivative Instruments, Cash collateral
Embedded Derivative Instruments, Non-cash collateral
Embedded Derivative Instruments, Net amount	672	941
Securities Lending and Reverse Repurchase Agreements, Cash collateral received	760
Securities Lending and Reverse Repurchase Agreements, Net amount	9	1,100
Total, Gross amount of recognized assets	8,380	7,545
Total, Gross amounts offset	(3,703)	(3,010)
Total, Net amount of assets	4,677	4,535
Total, Cash collateral	(3,538)	(3,273)
Total, Non-cash collateral	(467)	(321)
Total, Net amount	672	941
Fair Value of Collateral		8
Financial Liabilities
Derivative Instruments, Gross amount of recognized liabilities	129	260
Derivative Instruments, Gross amounts offset	(17)	(50)
Derivative Instruments, Net amount of liabilities	112	210
Derivative Instruments, Cash collateral	(112)	(172)
Derivative Instruments, Non-cash collateral		(38)
Derivative Instruments, Net amount
Embedded Derivative Instruments, Gross amount of recognized liabilities	5,796	4,783
Embedded Derivative Instruments, Gross amounts offset
Embedded Derivative Instruments, Net amount of liabilities	5,796	4,783
Embedded Derivative Instruments, Cash collateral
Embedded Derivative Instruments, Non-cash collateral
Embedded Derivative Instruments, Net amount	5,796	4,783
Total, Gross amount of recognized liabilities	5,925	5,043
Total, Gross amounts offset	(17)	(50)
Total, Net amount of liabilities	5,908	4,993
Total, Cash collateral	(112)	(172)
Total, Non-cash collateral		(38)
Total, Net amount	$ 5,796	$ 4,783