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Derivative Instruments (Schedule Of Offsetting Assets And Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Financial Assets    
Derivative Instruments, Gross amount of recognized assets $ 1,282 $ 1,082
Derivative Instruments, Gross amounts offset (201) (237)
Derivative Instruments, Net amount of assets 1,081 845
Derivative Instruments, Cash collateral (616) (701)
Derivative Instruments, Non-cash collateral (58)  
Derivative Instruments, Net amount 407 144
Embedded Derivative Instruments, Gross amount of recognized assets 1,285 965
Embedded Derivative Instruments, Gross amounts offset  
Embedded Derivative Instruments, Net amount of assets 1,285 965
Embedded Derivative Instruments, Cash collateral  
Embedded Derivative Instruments, Non-cash collateral  
Embedded Derivative Instruments, Net amount 1,285 965
Total, Gross amount of recognized assets 2,567 2,047
Total, Gross amounts offset (201) (237)
Total, Net amount of assets 2,366 1,810
Total, Cash collateral (616) (701)
Total, Non-cash collateral (58)  
Total, Net amount 1,692 1,109
Financial Liabilities    
Derivative Instruments, Gross amount of recognized liabilities 806 1,037
Derivative Instruments, Gross amounts offset (59) (261)
Derivative Instruments, Net amount of liabilities 747 776
Derivative Instruments, Cash collateral (66) (506)
Derivative Instruments, Non-cash collateral (190)  
Derivative Instruments, Net amount 491 270
Embedded Derivative Instruments, Gross amount of recognized liabilities 1,501 2,423
Embedded Derivative Instruments, Gross amounts offset  
Embedded Derivative Instruments, Net amount of liabilities 1,501 2,423
Embedded Derivative Instruments, Cash collateral  
Embedded Derivative Instruments, Non-cash collateral  
Embedded Derivative Instruments, Net amount 1,501 2,423
Total, Gross amount of recognized liabilities 2,307 3,460
Total, Gross amounts offset (59) (261)
Total, Net amount of liabilities 2,248 3,199
Total, Cash collateral (66)  
Total, Non-cash collateral (190) (506)
Total, Net amount $ 1,992 $ 2,693