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Taxation (Reconciliation of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Income Tax Contingency [Line Items] |  |
Balance, beginning of year | $ 67 | $ 64
Additions based on tax positions related to prior years | 9 | 4
Reductions for settlements with taxing authorities | (3) | (1)
Balance, end of year | $ 73 | $ 67

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