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	$ 7,664	$ 6,483
Derivative Instruments, Gross amounts offset	(3,676)	(2,964)
Derivative Instruments, Net amount of assets	3,988	3,519
Derivative Instruments, Cash collateral	(3,520)	(3,200)
Derivative Instruments, Non-cash collateral	(468)	(319)
Derivative Instruments, Net amount
Embedded Derivative Instruments, Gross amount of recognized assets	919	1,206
Embedded Derivative Instruments, Gross amounts offset
Embedded Derivative Instruments, Net amount of assets	919	1,206
Embedded Derivative Instruments, Cash collateral
Embedded Derivative Instruments, Non-cash collateral
Embedded Derivative Instruments, Net amount	919	1,206
Total, Gross amount of recognized assets	8,583	7,689
Total, Gross amounts offset	(3,676)	(2,964)
Total, Net amount of assets	4,907	4,725
Total, Cash collateral	(3,520)	(3,200)
Total, Non-cash collateral	(468)	(319)
Total, Net amount	919	1,206
Derivative Liability, Fair Value of Collateral	730	1,100
Financial Liabilities
Derivative Instruments, Gross amount of recognized liabilities	150	304
Derivative Instruments, Gross amounts offset	(1)	(50)
Derivative Instruments, Net amount of liabilities	149	254
Derivative Instruments, Cash collateral	(107)	(157)
Derivative Instruments, Non-cash collateral		(46)
Derivative Instruments, Net amount	42	51
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	5,946	5,087
Total, Gross amounts offset	(1)	(50)
Total, Net amount of liabilities	5,945	5,037
Total, Cash collateral	(107)	(157)
Total, Non-cash collateral		(46)
Total, Net amount	$ 5,838	$ 4,834