Derivative Instruments (Schedule Of Offsetting Assets And Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Financial Assets
Derivative Instruments, Gross amount of recognized assets	$ 7,938	$ 4,978
Derivative Instruments, Gross amounts offset	(2,241)	(1,869)
Derivative Instruments, Net amount of assets	5,697	3,109
Derivative Instruments, Cash collateral	(5,564)	(2,969)
Derivative Instruments, Non-cash collateral	(133)	(56)
Derivative Instruments, Net amount		84
Embedded Derivative Instruments, Gross amount of recognized assets	2,547	1,082
Embedded Derivative Instruments, Gross amounts offset
Embedded Derivative Instruments, Net amount of assets	2,547	1,082
Embedded Derivative Instruments, Cash collateral
Embedded Derivative Instruments, Non-cash collateral
Embedded Derivative Instruments, Net amount	2,547	1,082
Total, Gross amount of recognized assets	10,485	6,060
Total, Gross amounts offset	(2,241)	(1,869)
Total, Net amount of assets	8,244	4,191
Total, Cash collateral	(5,564)	(2,969)
Total, Non-cash collateral	(133)	(56)
Total, Net amount	2,547	1,166
Financial Liabilities
Derivative Instruments, Gross amount of recognized liabilities	349	902
Derivative Instruments, Gross amounts offset	(68)	(330)
Derivative Instruments, Net amount of liabilities	281	572
Derivative Instruments, Cash collateral	(44)	(182)
Derivative Instruments, Non-cash collateral
Derivative Instruments, Net amount	237	390
Embedded Derivative Instruments, Gross amount of recognized liabilities	8,724	4,665
Embedded Derivative Instruments, Gross amounts offset
Embedded Derivative Instruments, Net amount of liabilities	8,724	4,665
Embedded Derivative Instruments, Cash collateral
Embedded Derivative Instruments, Non-cash collateral
Embedded Derivative Instruments, Net amount	8,724	4,665
Total, Gross amount of recognized liabilities	9,073	5,567
Total, Gross amounts offset	(68)	(330)
Total, Net amount of liabilities	9,005	5,237
Total, Cash collateral	(44)	(182)
Total, Net amount	$ 8,961	$ 5,055