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Derivative Financial Instruments and Off-balance sheet Financial Instruments - Summary of the volume and fair value positions (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) contract | Dec. 31, 2016 USD ($) contract
Derivative Financial Instruments and Off-balance sheet Financial Instruments |  |
Assumed recoveries under sale of credit protection | $ 0 |
Cash and securities pledged in the form of margin deposits | 10 |
Derivatives, Fair Value |  |
Total asset derivatives, Notional amount | 255 | $ 1,103
Total liability derivatives, Notional amount | 3,133 | 2,673
Total derivatives, Notional amount | $ 3,388 | $ 3,776
Total asset derivatives, Number of contracts | contract | 6,605 | 4,233
Total liability derivatives, Number of contracts | contract | 7,128 | 4,848
Total derivatives, Number of contracts | contract | 13,733 | 9,081
Net amount on balance sheet | $ 126 | $ 93
Asset derivatives, Gross asset | 127 | 121
Asset derivatives, gross liability | (1) | (28)
Net amount on balance sheet | (363) | (334)
Total derivatives, Fair value, net | (237) | (241)
Liability derivatives, Gross asset | 6 | 0
Liability derivatives, Gross liability | (369) | (334)
Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total asset derivatives, Notional amount |  | $ 1,054
Total liability derivatives, Notional amount | $ 3,114 |
Total asset derivatives, Number of contracts | contract |  | 4,233
Total liability derivatives, Number of contracts | contract | 7,128 |
Net amount on balance sheet |  | $ 88
Asset derivatives, Gross asset |  | 116
Asset derivatives, gross liability |  | (28)
Net amount on balance sheet | $ (365) |
Liability derivatives, Gross asset | 4 |
Liability derivatives, Gross liability | (369) |
Foreign currency swap agreements | Other investments | Derivatives designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total asset derivatives, Notional amount |  | 49
Net amount on balance sheet |  | 5
Asset derivatives, Gross asset |  | 5
Asset derivatives, gross liability |  | 0
Foreign currency swap agreements | Other liabilities & accrued expenses | Derivatives designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total liability derivatives, Notional amount | 19 |
Net amount on balance sheet | 2 |
Liability derivatives, Gross asset | 2 |
Liability derivatives, Gross liability | 0 |
Interest rate cap agreements | Other investments | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total asset derivatives, Notional amount | 15 | 65
Net amount on balance sheet | 0 | 1
Asset derivatives, Gross asset | 0 | 1
Asset derivatives, gross liability | 0 | 0
Interest rate cap agreements | Other liabilities & accrued expenses | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total liability derivatives, Notional amount | 30 |
Net amount on balance sheet | 1 |
Liability derivatives, Gross asset | 1 |
Liability derivatives, Gross liability | 0 |
Options | Other investments | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total asset derivatives, Notional amount | $ 0 | $ 0
Total asset derivatives, Number of contracts | contract | 6,316 | 3,972
Net amount on balance sheet | $ 125 | $ 88
Asset derivatives, Gross asset | 125 | 88
Asset derivatives, gross liability | 0 | 0
Financial futures contracts | Other assets | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total asset derivatives, Notional amount | $ 0 | $ 0
Total asset derivatives, Number of contracts | contract | 289 | 261
Net amount on balance sheet | $ 0 | $ 0
Asset derivatives, Gross asset | 0 | 0
Asset derivatives, gross liability | 0 | 0
Options and futures | Other liabilities & accrued expenses | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total liability derivatives, Notional amount | $ 0 | $ 0
Total liability derivatives, Number of contracts | contract | 7,128 | 4,848
Net amount on balance sheet | $ (58) | $ (39)
Liability derivatives, Gross asset | 0 | 0
Liability derivatives, Gross liability | (58) | (39)
Foreign currency forwards | Other investments | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total asset derivatives, Notional amount | 52 | 759
Net amount on balance sheet | 1 | 0
Asset derivatives, Gross asset | 1 | 24
Asset derivatives, gross liability | 0 | (24)
Foreign currency forwards | Other liabilities & accrued expenses | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total liability derivatives, Notional amount | 650 |
Net amount on balance sheet | (17) |
Liability derivatives, Gross asset | 3 |
Liability derivatives, Gross liability | (20) |
Guaranteed accumulation benefits | Contractholder funds | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total liability derivatives, Notional amount | 225 | 391
Net amount on balance sheet | (22) | (34)
Liability derivatives, Gross asset | 0 | 0
Liability derivatives, Gross liability | (22) | (34)
Guaranteed withdrawal benefits | Contractholder funds | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total liability derivatives, Notional amount | 274 | 290
Net amount on balance sheet | (12) | (9)
Liability derivatives, Gross asset | 0 | 0
Liability derivatives, Gross liability | (12) | (9)
Equity-indexed and forward starting options in life and annuity product contracts | Contractholder funds | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total liability derivatives, Notional amount | 1,774 | 1,751
Net amount on balance sheet | (252) | (247)
Liability derivatives, Gross asset | 0 | 0
Liability derivatives, Gross liability | (252) | (247)
Credit default swaps – buying protection | Other investments | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total asset derivatives, Notional amount | 105 | 87
Net amount on balance sheet | (1) | (4)
Asset derivatives, Gross asset | 0 | 0
Asset derivatives, gross liability | (1) | (4)
Credit default swaps – buying protection | Other liabilities & accrued expenses | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total liability derivatives, Notional amount | 136 | 136
Net amount on balance sheet | (5) | (2)
Liability derivatives, Gross asset | 0 | 0
Liability derivatives, Gross liability | (5) | (2)
Credit default swaps – selling protection | Other investments | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total asset derivatives, Notional amount | 80 | 140
Net amount on balance sheet | 1 | 2
Asset derivatives, Gross asset | 1 | 2
Asset derivatives, gross liability | 0 | 0
Credit default swaps – selling protection | Other liabilities & accrued expenses | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total liability derivatives, Notional amount | 25 | 105
Net amount on balance sheet | 0 | (3)
Liability derivatives, Gross asset | 0 | 0
Liability derivatives, Gross liability | 0 | (3)
Other contracts | Other assets | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total asset derivatives, Notional amount | 3 | 3
Net amount on balance sheet | 0 | 1
Asset derivatives, Gross asset | 0 | 1
Asset derivatives, gross liability | $ 0 | $ 0

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