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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Operating Loss Carryforwards [Line Items] |  |  |  |
Statutory rate of income taxes | 21.00% | 21.00% | 21.00% | 21.00%
Provision (credit) for income taxes | $ 48 | $ (48) | $ 164 | $ (52)
Separate Return Limitation Year Tax Rules |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards subject to SRLY tax rules will expire unutilized at December 31, 2021 | $ 27 |  | $ 27 |
Neon Capital Limited |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Provision (credit) for income taxes |  | $ 73 |  |

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