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Derivative Instruments (Schedule Of Offsetting Assets And Liabilities) (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
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Financial Assets |  |
Derivative Instruments, Gross amount of recognized assets | $ 1,560 | $ 1,470
Derivative Instruments, Gross amounts offset | (600) | (543)
Derivative Instruments, Net amount of assets | 960 | 927
Derivative Instruments, Cash collateral | (935) | (894)
Derivative Instruments, Net amount | 25 | 33
Embedded Derivative Instruments, Gross amount of recognized assets | 626 |
Embedded Derivative Instruments, Gross amounts offset |  |
Embedded Derivative Instruments, Net amount of assets | 626 |
Embedded Derivative Instruments, Cash collateral |  |
Embedded Derivative Instruments, Net amount | 626 |
Total, Gross amount of recognized assets | 2,186 | 1,470
Total, Gross amounts offset | (600) | (543)
Total, Net amount of assets | 1,586 | 927
Total, Cash collateral | (935) | (894)
Total, Net amount | 651 | 33
Financial Liabilities |  |
Derivative Instruments, Gross amount of recognized liabilities | 658 | 1,089
Derivative Instruments, Gross amounts offset | (124) | (536)
Derivative Instruments, Net amount of liabilities | 534 | 553
Derivative Instruments, Cash collateral | (570) | (630)
Derivative Instruments, Net amount | (36) | (77)
Embedded Derivative Instruments, Gross amount of recognized liabilities | 1,388 | 1,563
Embedded Derivative Instruments, Gross amounts offset |  |
Embedded Derivative Instruments, Net amount of liabilities | 1,388 | 1,563
Embedded Derivative Instruments, Cash collateral |  |
Embedded Derivative Instruments, Net amount | 1,388 | 1,563
Total, Gross amount of recognized liabilities | 2,046 | 2,652
Total, Gross amounts offset | (124) | (536)
Total, Net amount of liabilities | 1,922 | 2,116
Total, Cash collateral | (570) | (630)
Total, Net amount | $ 1,352 | $ 1,486

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