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Derivative Financial Instruments - Summary of the volume and fair value positions of derivative instruments (Details) $ in Millions | Sep. 30, 2020 USD ($) contract | Dec. 31, 2019 USD ($) contract
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Cash and securities pledged in the form of margin deposits | $ 63 |
Derivatives, Fair Value |  |
Total asset derivatives, notional amount | 793 | $ 75
Total liability derivatives, notional amount | 3,065 | 3,403
Total derivatives, notional amount | $ 3,858 | $ 3,478
Total asset derivatives, number of contracts | contract | 4,260 | 10,740
Total liability derivatives, number of contracts | contract | 3,918 | 6,492
Total derivatives, Number of contracts | contract | 8,178 | 17,232
Derivative assets net amount on balance sheet | $ 133 | $ 142
Asset derivatives gross amount | 133 | 142
Asset derivatives, gross liability | 0 | 0
Derivative liabilities net amount on balance sheet | (544) | (507)
Total derivatives, fair value, net | (411) | (365)
Liability derivatives, gross asset | 25 | 39
Liability derivatives gross amount | (569) | (546)
Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total asset derivatives, notional amount | $ 790 | $ 73
Total asset derivatives, number of contracts | contract | 4,260 | 10,740
Derivative assets net amount on balance sheet | $ 133 | $ 142
Asset derivatives gross amount | 133 | 142
Asset derivatives, gross liability | $ 0 | $ 0
Other assets | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total asset derivatives, number of contracts | contract | 468 | 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 | $ 32 | 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 |  |
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, number of contracts | contract | 556 | 1,089
Derivative liabilities net amount on balance sheet | $ 0 | $ 0
Liability derivatives, gross asset | 0 | 0
Liability derivatives gross amount | $ 0 | $ 0
Equity and index contracts | Other liabilities & accrued expenses | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total liability derivatives, number of contracts | contract | 2,662 | 5,400
Derivative liabilities net amount on balance sheet | $ (60) | $ (68)
Liability derivatives, gross asset | 0 | 0
Liability derivatives gross amount | $ (60) | $ (68)
Options | Other investments | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total asset derivatives, number of contracts | contract | 2,829 | 5,539
Derivative assets net amount on balance sheet | $ 126 | $ 140
Asset derivatives gross amount | 126 | 140
Asset derivatives, gross liability | $ 0 | $ 0
Futures | Other assets | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total asset derivatives, number of contracts | contract | 963 | 1,533
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, number of contracts | contract | 700 | 3
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 – fixed income | Other investments | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total asset derivatives, notional amount |  | 56
Derivative assets net amount on balance sheet |  | 1
Asset derivatives gross amount |  | 1
Asset derivatives, gross liability |  | 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 | 80 | 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 asset derivatives, notional amount | 7 |
Derivative assets net amount on balance sheet | 0 |
Asset derivatives gross amount | 0 |
Asset derivatives, gross liability | 0 |
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 | 8 |
Derivative assets net amount on balance sheet | 0 |
Asset derivatives gross amount | 0 |
Asset derivatives, gross liability | 0 |
Foreign currency forwards | Other liabilities & accrued expenses | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total liability derivatives, notional amount | 720 | 745
Derivative liabilities net amount on balance sheet | 17 | 19
Liability derivatives, gross asset | 24 | 28
Liability derivatives gross amount | (7) | (9)
Guaranteed accumulation benefits | Contractholder funds | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total liability derivatives, notional amount | 133 | 161
Derivative liabilities net amount on balance sheet | (21) | (18)
Liability derivatives, gross asset | 0 | 0
Liability derivatives gross amount | (21) | (18)
Guaranteed withdrawal benefits | Contractholder funds | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total liability derivatives, notional amount | 188 | 205
Derivative liabilities net amount on balance sheet | (17) | (14)
Liability derivatives, gross asset | 0 | 0
Liability derivatives gross amount | (17) | (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 | 1,784 | 1,791
Derivative liabilities net amount on balance sheet | (459) | (430)
Liability derivatives, gross asset | 0 | 0
Liability derivatives gross amount | (459) | (430)
Credit default swaps – buying protection | Other investments | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total asset derivatives, notional amount | 25 | 17
Derivative assets net amount on balance sheet | 0 | 0
Asset derivatives gross amount | 0 | 0
Asset derivatives, gross liability | 0 | 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 | 119 | 152
Derivative liabilities net amount on balance sheet | (4) | (7)
Liability derivatives, gross asset | 1 | 0
Liability derivatives gross amount | (5) | (7)
Credit default swaps – selling protection | Other investments | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total asset derivatives, notional amount | 750 |
Derivative assets net amount on balance sheet | 6 |
Asset derivatives gross amount | 6 |
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 | 9 | 9
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 | 3 |
Derivative assets net amount on balance sheet | 0 |
Asset derivatives gross amount | 0 |
Asset derivatives, gross liability | $ 0 |

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