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Derivative Financial Instruments - FGL's Exposure to Credit Loss on Call Options Held (Detail) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Fair Value | $ 611 | $ 575
Not Designated as Hedging Instrument | Call options |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 18,515 | 15,909
Fair Value | 580 | 548
Collateral | 582 | 491
Maximum amount of loss due to credit risk | 40 | 58
Not Designated as Hedging Instrument | Call options | Merrill Lynch |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 2,180 | 1,932
Fair Value | 67 | 75
Collateral | 27 | 32
Maximum amount of loss due to credit risk | 40 | 43
Not Designated as Hedging Instrument | Call options | Morgan Stanley |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 2,051 | 1,503
Fair Value | 61 | 40
Collateral | 67 | 41
Maximum amount of loss due to credit risk | 0 | 0
Not Designated as Hedging Instrument | Call options | Barclay's Bank |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 5,508 | 4,639
Fair Value | 154 | 180
Collateral | 165 | 169
Maximum amount of loss due to credit risk | 0 | 11
Not Designated as Hedging Instrument | Call options | Canadian Imperial Bank of Commerce |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 2,499 | 2,276
Fair Value | 87 | 86
Collateral | 94 | 85
Maximum amount of loss due to credit risk | 0 | 1
Not Designated as Hedging Instrument | Call options | Wells Fargo |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 2,575 | 2,900
Fair Value | 87 | 106
Collateral | 90 | 105
Maximum amount of loss due to credit risk | 0 | 1
Not Designated as Hedging Instrument | Call options | Goldman Sachs |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 383 | 634
Fair Value | 11 | 15
Collateral | 13 | 15
Maximum amount of loss due to credit risk | 0 | 0
Not Designated as Hedging Instrument | Call options | Credit Suisse |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 2,184 | 1,373
Fair Value | 78 | 27
Collateral | 89 | 25
Maximum amount of loss due to credit risk | 0 | 2
Not Designated as Hedging Instrument | Call options | Truist |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 1,135 | 652
Fair Value | 35 | 19
Collateral | 37 | 19
Maximum amount of loss due to credit risk | $ 0 | $ 0

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