Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016	Jun. 30, 2015
Supplemental Cash Flow Information
Foreign, state and federal income taxes paid		$ 288	$ 638
Tax refund	$ 302
Interest paid		$ 154	$ 108