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Taxation (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Examination [Line Items] |  |  |
Valuation allowance | $ 92 | $ 83 |
Unrecognized Tax Benefits | 64 | 76 | $ 47
Income Tax Credits and Adjustments | 26 | 31 |
Unrecognized tax benefits that would affect the effective tax rate | 38 | 45 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | 1 | 8 | $ 5
Liabilities recorded for tax-related interest and penalties | 14 | $ 16 |
Domestic Tax Authority [Member] |  |  |
Income Tax Examination [Line Items] |  |  |
Net operating loss carry-forwards | $ 461 |  |
Switzerland |  |  |
Income Tax Examination [Line Items] |  |  |
Applicable income tax rates | 19.70% | 21.20% | 7.83%
Foreign Tax Authority [Member] |  |  |
Income Tax Examination [Line Items] |  |  |
Foreign tax credit carry-forward | $ 156 |  |
Bermuda |  |  |
Income Tax Examination [Line Items] |  |  |
Applicable income tax rates | 0.00% |  |
UNITED STATES |  |  |
Income Tax Examination [Line Items] |  |  |
Applicable income tax rates | 21.00% |  |
UNITED KINGDOM |  |  |
Income Tax Examination [Line Items] |  |  |
Applicable income tax rates | 19.00% |  |

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