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General - Supplemental Cash Flow Information (Details) - Continuing Operations - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
SUPPLEMENTAL CASH FLOW INFORMATION |  |
Income tax payments | $ (302) | $ (281)
Income tax refunds received | 45 | 96
Interest paid | (793) | (728)
Capitalized interest | $ 29 | $ 47

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