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Supplemental Cash Flow Information (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2016 | Sep. 30, 2015
Supplemental Cash Flow Information |  |
Foreign, state and federal income taxes paid | $ 442 | $ 848
Tax refund | 302 |
Interest paid | $ 224 | $ 198

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