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Taxation (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Examination [Line Items] |  |  |  |
Valuation allowance | $ 916 | $ 92 |  |
Unrecognized Tax Benefits | 67 | 64 | $ 76 |
Income Tax Credits and Adjustments | 21 | 26 |  |
Unrecognized tax benefits that would affect the effective tax rate | 46 | 38 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | 4 | 1 | $ 8 |
Liabilities recorded for tax-related interest and penalties | 18 | $ 14 |  |
Investments |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Valuation allowance | 815 |  |  |
Domestic Tax Authority [Member] |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Net operating loss carry-forwards | $ 346 |  |  |
Switzerland |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Applicable income tax rates | 19.70% | 19.70% | 21.20% | 7.83%
Foreign Tax Authority [Member] |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Foreign tax credit carry-forward | $ 76 |  |  |
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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