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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 $ 1,302 $ 1,282
Derivative Instruments, Gross amounts offset (328) (201)
Derivative Instruments, Net amount of assets 974 1,081
Derivative Instruments, Cash collateral (694) (616)
Derivative Instruments, Non-cash collateral (116) (58)
Derivative Instruments, Net amount 164 407
Embedded Derivative Instruments, Gross amount of recognized assets 1,361 1,285
Embedded Derivative Instruments, Gross amounts offset  
Embedded Derivative Instruments, Net amount of assets 1,361 1,285
Embedded Derivative Instruments, Cash collateral  
Embedded Derivative Instruments, Non-cash collateral  
Embedded Derivative Instruments, Net amount 1,361 1,285
Total, Gross amount of recognized assets 2,663 2,567
Total, Gross amounts offset (328) (201)
Total, Net amount of assets 2,335 2,366
Total, Cash collateral (694) (616)
Total, Non-cash collateral (116) (58)
Total, Net amount 1,525 1,692
Financial Liabilities    
Derivative Instruments, Gross amount of recognized liabilities 896 806
Derivative Instruments, Gross amounts offset (115) (59)
Derivative Instruments, Net amount of liabilities 781 747
Derivative Instruments, Cash collateral (116) (66)
Derivative Instruments, Non-cash collateral (346) (190)
Derivative Instruments, Net amount 319 491
Embedded Derivative Instruments, Gross amount of recognized liabilities 2,299 1,501
Embedded Derivative Instruments, Gross amounts offset  
Embedded Derivative Instruments, Net amount of liabilities 2,299 1,501
Embedded Derivative Instruments, Cash collateral  
Embedded Derivative Instruments, Non-cash collateral  
Embedded Derivative Instruments, Net amount 2,299 1,501
Total, Gross amount of recognized liabilities 3,195 2,307
Total, Gross amounts offset (115) (59)
Total, Net amount of liabilities 3,080 2,248
Total, Cash collateral (116) (66)
Total, Non-cash collateral (346) (190)
Total, Net amount $ 2,618 $ 1,992