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Derivative Financial Instruments - Summary of the volume and fair value positions of derivative instruments (Details) $ in Millions | Sep. 30, 2018 USD ($) contract | Dec. 31, 2017 USD ($) contract
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Cash and securities pledged in the form of margin deposits | $ 32 |
Derivatives, Fair Value |  |
Total asset derivatives, notional amount | 859 | $ 255
Total liability derivatives, notional amount | 2,481 | 3,133
Total derivatives, notional amount | $ 3,340 | $ 3,388
Total asset derivatives, number of contracts | contract | 11,872 | 6,605
Total liability derivatives, number of contracts | contract | 6,121 | 7,128
Total derivatives, Number of contracts | contract | 17,993 | 13,733
Derivative assets net amount on balance sheet | $ 115 | $ 126
Asset derivatives gross amount | 120 | 127
Asset derivatives, gross liability | (5) | (1)
Derivative liabilities net amount on balance sheet | (307) | (363)
Total derivatives, fair value, net | (192) | (237)
Liability derivatives, gross asset | 1 | 6
Liability derivatives gross amount | (308) | (369)
Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total liability derivatives, notional amount |  | $ 3,114
Total liability derivatives, number of contracts | contract |  | 7,128
Derivative liabilities net amount on balance sheet |  | $ (365)
Liability derivatives, gross asset |  | 4
Liability derivatives gross amount |  | (369)
Foreign currency swap agreements | Other liabilities & accrued expenses | Derivatives designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total liability derivatives, notional amount |  | 19
Derivative liabilities net amount on balance sheet |  | 2
Liability derivatives, gross asset |  | 2
Liability derivatives gross amount |  | 0
Interest rate cap agreements | Other investments | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total asset derivatives, notional amount | 20 | 15
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 | 18 | 30
Derivative liabilities net amount on balance sheet | 1 | 1
Liability derivatives, gross asset | 1 | 1
Liability derivatives gross amount | 0 | 0
Options | Other investments | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total asset derivatives, notional amount | 0 |
Total liability derivatives, notional amount | $ 0 |
Total asset derivatives, number of contracts | contract | 6,813 |
Total liability derivatives, number of contracts | contract | 1,062 |
Derivative assets net amount on balance sheet | $ 0 |
Asset derivatives gross amount | 0 |
Asset derivatives, gross liability | 0 |
Derivative liabilities net amount on balance sheet | 0 |
Liability derivatives, gross asset | 0 |
Liability derivatives gross amount | 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 | 3,842 | 6,316
Derivative assets net amount on balance sheet | $ 106 | $ 125
Asset derivatives gross amount | 106 | 125
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 | 1,217 | 289
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 investments | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total asset derivatives, notional amount | 60 |
Total liability derivatives, notional amount | 0 |
Derivative assets net amount on balance sheet | 2 |
Asset derivatives gross amount | 2 |
Asset derivatives, gross liability | 0 |
Derivative liabilities net amount on balance sheet | 0 |
Liability derivatives, gross asset | 0 |
Liability derivatives gross amount | 0 |
Total return swap agreements – equity index | Other investments | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total asset derivatives, notional amount | 23 |
Total liability derivatives, notional amount | 210 |
Derivative assets net amount on balance sheet | 0 |
Asset derivatives gross amount | 0 |
Asset derivatives, gross liability | 0 |
Derivative liabilities net amount on balance sheet | (1) |
Liability derivatives, gross asset | 0 |
Liability derivatives gross amount | (1) |
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 | 5,059 | 7,128
Derivative liabilities net amount on balance sheet | $ (40) | $ (58)
Liability derivatives, gross asset | 0 | 0
Liability derivatives gross amount | (40) | (58)
Foreign currency forwards | Other investments | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total asset derivatives, notional amount | 527 | 52
Derivative assets net amount on balance sheet | 10 | 1
Asset derivatives gross amount | 12 | 1
Asset derivatives, gross liability | (2) | 0
Foreign currency forwards | Other liabilities & accrued expenses | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total liability derivatives, notional amount | 0 | 650
Derivative liabilities net amount on balance sheet | 0 | (17)
Liability derivatives, gross asset | 0 | 3
Liability derivatives gross amount | 0 | (20)
Guaranteed accumulation benefits | Contractholder funds | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total liability derivatives, notional amount | 200 | 225
Derivative liabilities net amount on balance sheet | (17) | (22)
Liability derivatives, gross asset | 0 | 0
Liability derivatives gross amount | (17) | (22)
Guaranteed withdrawal benefits | Contractholder funds | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total liability derivatives, notional amount | 248 | 274
Derivative liabilities net amount on balance sheet | (10) | (12)
Liability derivatives, gross asset | 0 | 0
Liability derivatives gross amount | (10) | (12)
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 | 1,783 | 1,774
Derivative liabilities net amount on balance sheet | (239) | (252)
Liability derivatives, gross asset | 0 | 0
Liability derivatives gross amount | (239) | (252)
Credit default swaps – buying protection | Other investments | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total asset derivatives, notional amount | 222 | 105
Derivative assets net amount on balance sheet | (3) | (1)
Asset derivatives gross amount | 0 | 0
Asset derivatives, gross liability | (3) | (1)
Credit default swaps – buying protection | Other liabilities & accrued expenses | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total liability derivatives, notional amount | 21 | 136
Derivative liabilities net amount on balance sheet | (1) | (5)
Liability derivatives, gross asset | 0 | 0
Liability derivatives gross amount | (1) | (5)
Credit default swaps – selling protection | Other investments | Derivatives not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total asset derivatives, notional amount | 4 | 80
Derivative assets net amount on balance sheet | 0 | 1
Asset derivatives gross amount | 0 | 1
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 | 1 | 25
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 not designated as accounting hedging instruments |  |
Derivatives, Fair Value |  |
Total asset derivatives, notional amount | 3 | 3
Derivative assets net amount on balance sheet | 0 | 0
Asset derivatives gross amount | 0 | 0
Asset derivatives, gross liability | $ 0 | $ 0

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