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Taxation (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Examination [Line Items] |  |  |  |
Unrecognized Tax Benefits |  | $ 76 | $ 47 | $ 14
Income Tax Credits and Adjustments |  | 31 | 19 |
Valuation allowance |  | 83 | 114 |
Unrecognized tax benefits that would affect the effective tax rate |  | 45 | 28 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense |  | 8 | 5 |
Liabilities recorded for tax-related interest and penalties |  | 16 | $ 8 |
Subsequent Event [Member] |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Tax Adjustments, Settlements, and Unusual Provisions | $ 23 |  |  |
Domestic Tax Authority [Member] |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Net operating loss carry-forwards |  | $ 407 |  |
Switzerland |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Applicable income tax rates |  | 21.20% | 7.83% | 7.83%
Foreign Tax Authority [Member] |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Foreign tax credit carry-forward |  | $ 222 |  |
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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