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Derivative Financial Instruments - Summary of the volume and fair value positions of derivative instruments (Details) $ in Millions | Sep. 30, 2019 USD ($) contract | Dec. 31, 2018 USD ($) contract | Sep. 30, 2018 contract
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |
Cash and securities pledged in the form of margin deposits | $ 50 |  |
Derivatives, Fair Value |  |  |
Total asset derivatives, notional amount | 645 | $ 470 |
Total liability derivatives, notional amount | 2,836 | 2,675 |
Total derivatives, notional amount | $ 3,481 | $ 3,145 |
Total asset derivatives, number of contracts | contract | 13,571 | 13,914 |
Total liability derivatives, number of contracts | contract | 13,314 | 12,256 |
Total derivatives, Number of contracts | contract | 26,885 | 26,170 |
Derivative assets net amount on balance sheet | $ 150 | $ 124 |
Asset derivatives gross amount | 155 | 130 |
Asset derivatives, gross liability | (5) | (6) |
Derivative liabilities net amount on balance sheet | (477) | (269) |
Total derivatives, fair value, net | (327) | (145) |
Liability derivatives, gross asset | 32 | 12 |
Liability derivatives gross amount | (509) | $ (281) |
Derivatives designated as fair value accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total derivatives, Number of contracts | contract |  |  | 1
Derivatives not designated as accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total asset derivatives, notional amount | $ 643 |  |
Total asset derivatives, number of contracts | contract | 13,571 |  |
Derivative assets net amount on balance sheet | $ 150 |  |
Asset derivatives gross amount | 155 |  |
Asset derivatives, gross liability | $ (5) |  |
Other assets | Derivatives not designated as accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total asset derivatives, number of contracts | contract | 2,674 | 1,330 |
Interest rate cap agreements | Other investments | Derivatives not designated as accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total asset derivatives, notional amount | $ 21 | $ 6 |
Derivative assets net amount on balance sheet | 0 | 0 |
Asset derivatives gross amount | 0 | 0 |
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 | 14 | 31 |
Derivative liabilities net amount on balance sheet | 0 | 1 |
Liability derivatives, gross asset | 0 | 1 |
Liability derivatives gross amount | 0 | 0 |
Futures | Other assets | Derivatives not designated as accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total asset derivatives, notional amount | 0 | 0 |
Derivative assets net amount on balance sheet | 0 | 1 |
Asset derivatives gross amount | 0 | 1 |
Asset derivatives, gross liability | 0 | 0 |
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 | 2,915 | 1,300 |
Derivative liabilities net amount on balance sheet | $ 0 | $ (1) |
Liability derivatives, gross asset | 0 | 0 |
Liability derivatives gross amount | 0 | (1) |
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 | 9,290 | 11,131 |
Derivative assets net amount on balance sheet | $ 131 | $ 115 |
Asset derivatives gross amount | 131 | 115 |
Asset derivatives, gross liability | 0 | 0 |
Futures | 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 | 1,607 | 1,453 |
Derivative assets net amount on balance sheet | $ 1 | $ 1 |
Asset derivatives gross amount | 1 | 1 |
Asset derivatives, gross liability | 0 | 0 |
Futures | Other liabilities & accrued expenses | Derivatives not designated as accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total liability derivatives, notional amount | $ 0 |  |
Total liability derivatives, number of contracts | contract | 1,383 |  |
Derivative liabilities net amount on balance sheet | $ (1) |  |
Liability derivatives, gross asset | 0 |  |
Liability derivatives gross amount | (1) |  |
Total return swap agreements – fixed income | Other investments | Derivatives not designated as accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total asset derivatives, notional amount | 7 | 7 |
Derivative assets net amount on balance sheet | 0 | 0 |
Asset derivatives gross amount | 0 | 0 |
Asset derivatives, gross liability | 0 | 0 |
Total return swap agreements – fixed income | Other liabilities & accrued expenses | Derivatives not designated as accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total liability derivatives, notional amount | 228 | 38 |
Derivative liabilities net amount on balance sheet | 8 | (1) |
Liability derivatives, gross asset | 8 | 0 |
Liability derivatives gross amount | 0 | (1) |
Total return swap agreements – equity index | Other investments | Derivatives not designated as accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total asset derivatives, notional amount | 170 | 61 |
Derivative assets net amount on balance sheet | 3 | (2) |
Asset derivatives gross amount | 3 | 0 |
Asset derivatives, gross liability | 0 | (2) |
Total return swap agreements – equity index | Other liabilities & accrued expenses | Derivatives not designated as accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total liability derivatives, notional amount |  | 71 |
Derivative liabilities net amount on balance sheet |  | (4) |
Liability derivatives, gross asset |  | 0 |
Liability derivatives gross amount |  | (4) |
Options | 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 | 9,016 | 10,956 |
Derivative liabilities net amount on balance sheet | $ (52) | $ (50) |
Liability derivatives, gross asset | 0 | 0 |
Liability derivatives gross amount | (52) | (50) |
Foreign currency forwards | Other investments | Derivatives not designated as accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total asset derivatives, notional amount | 291 | 258 |
Derivative assets net amount on balance sheet | 19 | 10 |
Asset derivatives gross amount | 20 | 11 |
Asset derivatives, gross liability | (1) | (1) |
Foreign currency forwards | Other liabilities & accrued expenses | Derivatives not designated as accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total liability derivatives, notional amount | 396 | 341 |
Derivative liabilities net amount on balance sheet | 23 | 10 |
Liability derivatives, gross asset | 24 | 11 |
Liability derivatives gross amount | (1) | (1) |
Guaranteed accumulation benefits | Contractholder funds | Derivatives not designated as accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total liability derivatives, notional amount | 161 | 169 |
Derivative liabilities net amount on balance sheet | (21) | (25) |
Liability derivatives, gross asset | 0 | 0 |
Liability derivatives gross amount | (21) | (25) |
Guaranteed withdrawal benefits | Contractholder funds | Derivatives not designated as accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total liability derivatives, notional amount | 205 | 210 |
Derivative liabilities net amount on balance sheet | (16) | (14) |
Liability derivatives, gross asset | 0 | 0 |
Liability derivatives gross amount | (16) | (14) |
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 | 1,782 | 1,770 |
Derivative liabilities net amount on balance sheet | (417) | (185) |
Liability derivatives, gross asset | 0 | 0 |
Liability derivatives gross amount | (417) | (185) |
Credit default swaps – buying protection | Other investments | Derivatives not designated as accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total asset derivatives, notional amount | 149 | 136 |
Derivative assets net amount on balance sheet | (4) | (1) |
Asset derivatives gross amount | 0 | 2 |
Asset derivatives, gross liability | (4) | (3) |
Credit default swaps – buying protection | Other liabilities & accrued expenses | Derivatives not designated as accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total liability derivatives, notional amount | 46 | 40 |
Derivative liabilities net amount on balance sheet | (1) | 0 |
Liability derivatives, gross asset | 0 | 0 |
Liability derivatives gross amount | (1) | 0 |
Credit default swaps – selling protection | Other investments | Derivatives not designated as accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total asset derivatives, notional amount | 5 |  |
Derivative assets net amount on balance sheet | 0 |  |
Asset derivatives gross amount | 0 |  |
Asset derivatives, gross liability | 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 | 4 | 5 |
Derivative liabilities net amount on balance sheet | 0 | 0 |
Liability derivatives, gross asset | 0 | 0 |
Liability derivatives gross amount | 0 | 0 |
Other | Other assets | Derivatives designated as fair value accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total asset derivatives, notional amount | 2 |  |
Derivative assets net amount on balance sheet | 0 |  |
Asset derivatives gross amount | 0 |  |
Asset derivatives, gross liability | $ 0 |  |
Other | Other assets | Derivatives not designated as accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total asset derivatives, notional amount |  | 2 |
Derivative assets net amount on balance sheet |  | 0 |
Asset derivatives gross amount |  | 0 |
Asset derivatives, gross liability |  | $ 0 |

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