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Derivative Financial Instruments - Summary of the volume and fair value positions of derivative instruments (Details) $ in Millions | Mar. 31, 2020 USD ($) contract | Dec. 31, 2019 USD ($) contract | Mar. 31, 2019 contract
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |
Cash and securities pledged in the form of margin deposits | $ 39 |  |
Derivatives, Fair Value |  |  |
Total asset derivatives, notional amount | 835 | $ 75 |
Total liability derivatives, notional amount | 3,051 | 3,403 |
Total derivatives, notional amount | $ 3,886 | $ 3,478 |
Total asset derivatives, number of contracts | contract | 3,842 | 10,740 |
Total liability derivatives, number of contracts | contract | 11,300 | 6,492 |
Total derivatives, Number of contracts | contract | 15,142 | 17,232 |
Derivative assets net amount on balance sheet | $ 59 | $ 142 |
Asset derivatives gross amount | 69 | 142 |
Asset derivatives, gross liability | (10) | 0 |
Derivative liabilities net amount on balance sheet | (421) | (507) |
Total derivatives, fair value, net | (362) | (365) |
Liability derivatives, gross asset | 8 | 39 |
Liability derivatives gross amount | (429) | (546) |
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 | $ 833 | $ 73 |
Total asset derivatives, number of contracts | contract | 3,842 | 10,740 |
Derivative assets net amount on balance sheet | $ 59 | $ 142 |
Asset derivatives gross amount | 69 | 142 |
Asset derivatives, gross liability | $ (10) | $ 0 |
Other assets | Derivatives not designated as accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total asset derivatives, number of contracts | contract | 568 | 3,668 |
Currency Swap | Other investments | 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 |
Interest rate cap agreements | Other liabilities & accrued expenses | Derivatives not designated as accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total liability derivatives, notional amount | $ 33 | 34 |
Derivative liabilities net amount on balance sheet | 0 | 0 |
Liability derivatives, gross asset | 0 | 0 |
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 | 0 |
Asset derivatives gross amount | 0 | 0 |
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 | 6,808 | 1,089 |
Derivative liabilities net amount on balance sheet | $ (1) | $ 0 |
Liability derivatives, gross asset | 0 | 0 |
Liability derivatives gross amount | (1) | 0 |
Equity and index contracts | 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 | 3,016 | 5,400 |
Derivative liabilities net amount on balance sheet | $ (4) | $ (68) |
Liability derivatives, gross asset | 0 | 0 |
Liability derivatives gross amount | (4) | (68) |
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 | 3,262 | 5,539 |
Derivative assets net amount on balance sheet | $ 21 | $ 140 |
Asset derivatives gross amount | 21 | 140 |
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 | 12 | 1,533 |
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 | 1,476 | 3 |
Derivative liabilities net amount on balance sheet | $ (2) | $ 0 |
Liability derivatives, gross asset | 0 | 0 |
Liability derivatives gross amount | (2) | 0 |
Total return swap agreements – fixed income | Other investments | Derivatives not designated as accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total asset derivatives, notional amount | 83 | 56 |
Derivative assets net amount on balance sheet | (5) | 1 |
Asset derivatives gross amount | 0 | 1 |
Asset derivatives, gross liability | (5) | 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 | 2 | 119 |
Derivative liabilities net amount on balance sheet | 0 | 0 |
Liability derivatives, gross asset | 0 | 0 |
Liability derivatives gross amount | 0 | 0 |
Total return swap agreements – equity index | Other investments | Derivatives not designated as accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total liability derivatives, notional amount | 6 |  |
Derivative liabilities net amount on balance sheet | (1) |  |
Liability derivatives, gross asset | 0 |  |
Liability derivatives gross amount | (1) |  |
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 |  | 187 |
Derivative liabilities net amount on balance sheet |  | 11 |
Liability derivatives, gross asset |  | 11 |
Liability derivatives gross amount |  | 0 |
Foreign currency forwards | Other investments | Derivatives not designated as accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total asset derivatives, notional amount | 629 |  |
Derivative assets net amount on balance sheet | 42 |  |
Asset derivatives gross amount | 44 |  |
Asset derivatives, gross liability | (2) |  |
Foreign currency forwards | Other liabilities & accrued expenses | Derivatives not designated as accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total liability derivatives, notional amount | 145 | 745 |
Derivative liabilities net amount on balance sheet | 6 | 19 |
Liability derivatives, gross asset | 7 | 28 |
Liability derivatives gross amount | (1) | (9) |
Guaranteed accumulation benefits | Contractholder funds | Derivatives not designated as accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total liability derivatives, notional amount | 127 | 161 |
Derivative liabilities net amount on balance sheet | (33) | (18) |
Liability derivatives, gross asset | 0 | 0 |
Liability derivatives gross amount | (33) | (18) |
Guaranteed withdrawal benefits | Contractholder funds | Derivatives not designated as accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total liability derivatives, notional amount | 164 | 205 |
Derivative liabilities net amount on balance sheet | (23) | (14) |
Liability derivatives, gross asset | 0 | 0 |
Liability derivatives gross amount | (23) | (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 | 1,768 | 1,791 |
Derivative liabilities net amount on balance sheet | (361) | (430) |
Liability derivatives, gross asset | 0 | 0 |
Liability derivatives gross amount | (361) | (430) |
Credit default swaps – buying protection | Other investments | Derivatives not designated as accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total asset derivatives, notional amount | 114 | 17 |
Derivative assets net amount on balance sheet | 1 | 0 |
Asset derivatives gross amount | 4 | 0 |
Asset derivatives, gross liability | (3) | 0 |
Credit default swaps – buying protection | Other liabilities & accrued expenses | Derivatives not designated as accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total liability derivatives, notional amount | 54 | 152 |
Derivative liabilities net amount on balance sheet | 0 | (7) |
Liability derivatives, gross asset | 1 | 0 |
Liability derivatives gross amount | (1) | (7) |
Credit default swaps – selling protection | Other investments | Derivatives not designated as accounting hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Total asset derivatives, notional amount | 7 |  |
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 | 752 | 9 |
Derivative liabilities net amount on balance sheet | (2) | 0 |
Liability derivatives, gross asset | 0 | 0 |
Liability derivatives gross amount | (2) | $ 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 |  |

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