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Schedule of Components of Income Tax Expense (Recovery) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Current tax |  |  |  |
Current tax | $ 103 | $ 96 | $ 233 | $ 229
Deferred tax |  |  |  |
Deferred tax | (62) | 20 | (25) | 88
Income tax expense | $ 41 | $ 116 | $ 208 | $ 317

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