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Derivative Instruments (Balance Sheet Offsetting) (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financial Assets |  |
Derivative Instruments, Gross amount of recognized assets | $ 1,532 | $ 1,470
Derivative Instruments, Gross amounts offset | (541) | (543)
Derivative Instruments, Net amount of assets | 991 | 927
Derivative Instruments, Cash collateral | (922) | (894)
Derivative Instruments, Net amount | 69 | 33
Embedded Derivative Instruments, Gross amount of recognized assets | 226 |
Embedded Derivative Instruments, Gross amounts offset |  |
Embedded Derivative Instruments, Net amount of assets | 226 |
Embedded Derivative Instruments, Cash collateral |  |
Embedded Derivative Instruments, Net amount | 226 |
Total, Gross amount of recognized assets | 1,758 | 1,470
Total, Gross amounts offset | (541) | (543)
Total, Net amount of assets | 1,217 | 927
Total, Cash collateral | (922) | (894)
Total, Net amount | 295 | 33
Financial Liabilities |  |
Derivative Instruments, Gross amount of recognized liabilities | 589 | 1,089
Derivative Instruments, Gross amounts offset | (105) | (536)
Derivative Instruments, Net amount of liabilities | 484 | 553
Derivative Instruments, Cash collateral | (489) | (630)
Derivative Instruments, Net amount | (5) | (77)
Embedded Derivative Instruments, Gross amount of recognized liabilities | 1,288 | 1,563
Embedded Derivative Instruments, Gross amounts offset |  |
Embedded Derivative Instruments, Net amount of liabilities | 1,288 | 1,563
Embedded Derivative Instruments, Cash collateral |  |
Embedded Derivative Instruments, Net amount | 1,288 | 1,563
Total, Gross amount of recognized liabilities | 1,877 | 2,652
Total, Gross amounts offset | (105) | (536)
Total, Net amount of liabilities | 1,772 | 2,116
Total, Cash collateral | (489) | (630)
Total, Net amount | $ 1,283 | $ 1,486

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