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Derivative Financial Instruments - Summary of the volume and fair value positions of derivative instruments (Details) $ in Millions | Jun. 30, 2019 USD ($) contract | Dec. 31, 2018 USD ($) contract | Jun. 30, 2018 contract
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |
Cash and securities pledged in the form of margin deposits | $ 46 |  |
Derivatives, Fair Value |  |  |
Total asset derivatives, notional amount | 805 | $ 470 |
Total liability derivatives, notional amount | 2,630 | 2,675 |
Total derivatives, notional amount | $ 3,435 | $ 3,145 |
Total asset derivatives, number of contracts | contract | 11,633 | 13,914 |
Total liability derivatives, number of contracts | contract | 13,265 | 12,256 |
Total derivatives, Number of contracts | contract | 24,898 | 26,170 |
Derivative assets net amount on balance sheet | $ 148 | $ 124 |
Asset derivatives gross amount | 152 | 130 |
Asset derivatives, gross liability | (4) | (6) |
Derivative liabilities net amount on balance sheet | (477) | (269) |
Total derivatives, fair value, net | (329) | (145) |
Liability derivatives, gross asset | 11 | 12 |
Liability derivatives gross amount | $ (488) | $ (281) |
Derivatives designated as fair value accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total derivatives, Number of contracts | contract | 1 |  | 1
Other assets | Derivatives not designated as accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total asset derivatives, number of contracts | contract | 561 | 1,330 |
Interest rate cap agreements | Other investments | Derivatives not designated as accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total asset derivatives, notional amount | $ 1 | $ 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 | 35 | 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 | 3,050 | 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 | 9,362 | 11,131 |
Derivative assets net amount on balance sheet | $ 122 | $ 115 |
Asset derivatives gross amount | 122 | 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 | 1,710 | 1,453 |
Derivative assets net amount on balance sheet | $ 2 | $ 1 |
Asset derivatives gross amount | 2 | 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 | 1,001 |  |
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 | 235 | 7 |
Derivative assets net amount on balance sheet | 8 | 0 |
Asset derivatives gross amount | 8 | 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 | 95 | 38 |
Derivative liabilities net amount on balance sheet | 2 | (1) |
Liability derivatives, gross asset | 2 | 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 | 172 | 61 |
Derivative assets net amount on balance sheet | 6 | (2) |
Asset derivatives gross amount | 6 | 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 | 9,214 | 10,956 |
Derivative liabilities net amount on balance sheet | $ (47) | $ (50) |
Liability derivatives, gross asset | 0 | 0 |
Liability derivatives gross amount | (47) | (50) |
Foreign currency forwards | Other investments | Derivatives not designated as accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total asset derivatives, notional amount | 257 | 258 |
Derivative assets net amount on balance sheet | 14 | 10 |
Asset derivatives gross amount | 14 | 11 |
Asset derivatives, gross liability | 0 | (1) |
Foreign currency forwards | Other liabilities & accrued expenses | Derivatives not designated as accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total liability derivatives, notional amount | 279 | 341 |
Derivative liabilities net amount on balance sheet | 7 | 10 |
Liability derivatives, gross asset | 8 | 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 | 172 | 169 |
Derivative liabilities net amount on balance sheet | (22) | (25) |
Liability derivatives, gross asset | 0 | 0 |
Liability derivatives gross amount | (22) | (25) |
Guaranteed withdrawal benefits | Contractholder funds | Derivatives not designated as accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total liability derivatives, notional amount | 209 | 210 |
Derivative liabilities net amount on balance sheet | (14) | (14) |
Liability derivatives, gross asset | 0 | 0 |
Liability derivatives gross amount | (14) | (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 | (401) | (185) |
Liability derivatives, gross asset | 0 | 0 |
Liability derivatives gross amount | (401) | (185) |
Credit default swaps – buying protection | Other investments | Derivatives not designated as accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total asset derivatives, notional amount | 138 | 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 | 49 | 40 |
Derivative liabilities net amount on balance sheet | (1) | 0 |
Liability derivatives, gross asset | 1 | 0 |
Liability derivatives gross amount | (2) | 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 | 9 | 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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