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Taxation (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax Examination [Line Items] |  |  |
Valuation allowance | $ 716 | $ 916 |
Unrecognized Tax Benefits | 73 | 67 | $ 64
Income Tax Credits and Adjustments | 19 | 21 |
Unrecognized tax benefits that would affect the effective tax rate | 54 | 46 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | 7 | 4 | $ 1
Liabilities recorded for tax-related interest and penalties | 25 | 18 |
Loss carry-forwards | 149 | 104 |
Loss carry-forwards | 149 | $ 104 |
Investments |  |  |
Income Tax Examination [Line Items] |  |  |
Valuation allowance | 441 |  |
Domestic Tax Authority [Member] |  |  |
Income Tax Examination [Line Items] |  |  |
Net operating loss carry-forwards | 497 |  |
Loss carry-forwards | 25 |  |
Loss carry-forwards | $ 25 |  |
Switzerland |  |  |
Income Tax Examination [Line Items] |  |  |
Applicable income tax rates | 19.70% |  |
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 | 23.50% |  |

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