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Derivative Instruments (Schedule Of Offsetting Assets And Liabilities) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Financial Assets    
Derivative Instruments, Gross amount of recognized assets $ 1,350 $ 1,330
Derivative Instruments, Gross amounts offset (369) (223)
Derivative Instruments, Net amount of assets 981 1,107
Derivative Instruments, Cash collateral (694) (636)
Derivative Instruments, Non-cash collateral (116) (58)
Derivative Instruments, Net amount 171 413
Embedded Derivative Instruments, Gross amount of recognized assets 1,361 1,097
Embedded Derivative Instruments, Gross amounts offset  
Embedded Derivative Instruments, Net amount of assets 1,361 1,097
Embedded Derivative Instruments, Cash collateral  
Embedded Derivative Instruments, Non-cash collateral  
Embedded Derivative Instruments, Net amount 1,361 1,097
Total, Gross amount of recognized assets 2,711 2,427
Total, Gross amounts offset (369) (223)
Total, Net amount of assets 2,342 2,204
Total, Cash collateral (694) (636)
Total, Non-cash collateral (116) (58)
Total, Net amount 1,532 1,510
Financial Liabilities    
Derivative Instruments, Gross amount of recognized liabilities 910 784
Derivative Instruments, Gross amounts offset (148) (103)
Derivative Instruments, Net amount of liabilities 762 681
Derivative Instruments, Cash collateral (285) (155)
Derivative Instruments, Non-cash collateral (346) (190)
Derivative Instruments, Net amount 131 336
Embedded Derivative Instruments, Gross amount of recognized liabilities 1,915 1,308
Embedded Derivative Instruments, Gross amounts offset  
Embedded Derivative Instruments, Net amount of liabilities 1,915 1,308
Embedded Derivative Instruments, Cash collateral  
Embedded Derivative Instruments, Non-cash collateral  
Embedded Derivative Instruments, Net amount 1,915 1,308
Total, Gross amount of recognized liabilities 2,825 2,092
Total, Gross amounts offset (148) (103)
Total, Net amount of liabilities 2,677 1,989
Total, Cash collateral (285) (155)
Total, Non-cash collateral (346) (190)
Total, Net amount $ 2,046 $ 1,644