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Derivative Instruments (Schedule Of Offsetting Assets And Liabilities) (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Financial Assets    
Derivative Instruments, Gross amount of recognized assets $ 1,172 $ 1,301
Derivative Instruments, Gross amounts offset (345) (386)
Derivative Instruments, Net amount of assets 827 915
Derivative Instruments, Cash collateral (681) (765)
Derivative Instruments, Non-cash collateral (80)  
Derivative Instruments, Net amount 66 150
Embedded Derivative Instruments, Gross amount of recognized assets 1,172 965
Embedded Derivative Instruments, Gross amounts offset  
Embedded Derivative Instruments, Net amount of assets 1,172 965
Embedded Derivative Instruments, Cash collateral  
Embedded Derivative Instruments, Non-cash collateral  
Embedded Derivative Instruments, Net amount 1,172 965
Total, Gross amount of recognized assets 2,344 2,266
Total, Gross amounts offset (345) (386)
Total, Net amount of assets 1,999 1,880
Total, Cash collateral (681) (765)
Total, Non-cash collateral (80)  
Total, Net amount 1,238 1,115
Financial Liabilities    
Derivative Instruments, Gross amount of recognized liabilities 634 955
Derivative Instruments, Gross amounts offset (278) (296)
Derivative Instruments, Net amount of liabilities 356 659
Derivative Instruments, Cash collateral (158) (581)
Derivative Instruments, Non-cash collateral (198)  
Derivative Instruments, Net amount 78
Embedded Derivative Instruments, Gross amount of recognized liabilities 1,491 1,542
Embedded Derivative Instruments, Gross amounts offset  
Embedded Derivative Instruments, Net amount of liabilities 1,491 1,542
Embedded Derivative Instruments, Cash collateral  
Embedded Derivative Instruments, Non-cash collateral  
Embedded Derivative Instruments, Net amount 1,491 1,542
Total, Gross amount of recognized liabilities 2,125 2,497
Total, Gross amounts offset (278) (296)
Total, Net amount of liabilities 1,847 2,201
Total, Cash collateral (158) (581)
Total, Non-cash collateral (198)  
Total, Net amount $ 1,491 $ 1,620