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Derivative Instruments (Schedule Of Offsetting Assets And Liabilities) (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Financial Assets    
Derivative Instruments, Gross amount of recognized assets $ 4,131 $ 2,619
Derivative Instruments, Gross amounts offset (1,174) (708)
Derivative Instruments, Net amount of assets 2,957 1,911
Derivative Instruments, Cash collateral (2,779) (1,387)
Derivative Instruments, Non-cash collateral (242)
Derivative Instruments, Net amount 178 282
Embedded Derivative Instruments, Gross amount of recognized assets 1,235 1,437
Embedded Derivative Instruments, Gross amounts offset  
Embedded Derivative Instruments, Net amount of assets 1,235 1,437
Embedded Derivative Instruments, Cash collateral  
Embedded Derivative Instruments, Non-cash collateral  
Embedded Derivative Instruments, Net amount 1,235 1,437
Total, Gross amount of recognized assets 5,366 4,056
Total, Gross amounts offset (1,174) (708)
Total, Net amount of assets 4,192 3,348
Total, Cash collateral (2,779) (1,387)
Total, Non-cash collateral   (242)
Total, Net amount 1,413 1,719
Financial Liabilities    
Derivative Instruments, Gross amount of recognized liabilities 1,950 1,005
Derivative Instruments, Gross amounts offset (233) (138)
Derivative Instruments, Net amount of liabilities 1,717 867
Derivative Instruments, Cash collateral (1,588) (557)
Derivative Instruments, Non-cash collateral  
Derivative Instruments, Net amount 129 310
Embedded Derivative Instruments, Gross amount of recognized liabilities 5,603 2,921
Embedded Derivative Instruments, Gross amounts offset  
Embedded Derivative Instruments, Net amount of liabilities 5,603 2,921
Embedded Derivative Instruments, Cash collateral  
Embedded Derivative Instruments, Non-cash collateral  
Embedded Derivative Instruments, Net amount 5,603 2,921
Total, Gross amount of recognized liabilities 7,553 3,926
Total, Gross amounts offset (233) (138)
Total, Net amount of liabilities 7,320 3,788
Total, Cash collateral (1,588) (557)
Total, Net amount $ 5,732 $ 3,231