Additional Financial Statement Information (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash Paid During the Year For
Interest, Net of Amount Capitalized	$ 260	$ 189	$ 137
Income Taxes Paid, Net	202	150	165
Non-Cash Financing and Investing Activities
Increase in Capital Lease and Other Obligations	$ 55	$ 110	$ 96