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Income Taxes (Summary of Valuation Allowance) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Valuation Allowance [Line Items] |  |
Net Gross Deferred Asset (Liability) | $ 360 |
Valuation Allowance | (204) | $ (220)
Deferred tax assets, net | 156 | $ 271
United States |  |
Valuation Allowance [Line Items] |  |
Net Gross Deferred Asset (Liability) | 362 |
Valuation Allowance | (166) |
Deferred tax assets, net | 196 |
United Kingdom |  |
Valuation Allowance [Line Items] |  |
Net Gross Deferred Asset (Liability) | (61) |
Valuation Allowance | 0 |
Deferred tax liabilities, net | (61) |
Australia |  |
Valuation Allowance [Line Items] |  |
Net Gross Deferred Asset (Liability) | 11 |
Valuation Allowance | 0 |
Deferred tax assets, net | 11 |
Canada |  |
Valuation Allowance [Line Items] |  |
Net Gross Deferred Asset (Liability) | 22 |
Valuation Allowance | (21) |
Deferred tax assets, net | 1 |
Other |  |
Valuation Allowance [Line Items] |  |
Net Gross Deferred Asset (Liability) | 26 |
Valuation Allowance | (17) |
Deferred tax assets, net | $ 9 |

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