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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Supplemental Cash Flow Elements      
Cash income tax payments, net of refunds $ 2,331 $ 1,968 $ 1,803
Cash interest payments 134 178 169
Capitalized interest $ 13 $ 15 $ 21