Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash Flows from Operating Activities:
Net Income	$ 427	$ 110
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	930	872
Non-cash compensation expense attributable to stock awards	121	92
Loss on modification and extinguishment of debt	40	163
Venezuela deconsolidation charge	0	171
Accretion of debt discount and amortization of debt issuance costs	15	18
Accrued interest on long-term debt, net	27	(28)
Deferred income taxes	163	5
(Gain) Loss on sale of property, plant and equipment and other assets	(1)	1
Other, net	(7)	32
Changes in working capital items:
Receivables	16	(130)
Other current assets	(40)	(21)
Accounts payable	99	(1)
Deferred revenue	21	59
Other current liabilities	(25)	(44)
Net Cash Provided by Operating Activities	1,786	1,299
Cash Flows from Investing Activities:
Capital expenditures	(1,028)	(899)
Cash related to deconsolidated Venezuela operations	0	(83)
Change in restricted cash and securities, net	11	(24)
Proceeds from sale of property, plant and equipment and other assets	1	3
Other	0	(14)
Net Cash Used in Investing Activities	(1,016)	(1,017)
Cash Flows from Financing Activities:
Long-term debt borrowings, net of issuance costs	764	3,947
Payments on and repurchases of long-term debt and capital leases	(818)	(4,102)
Net Cash Used in Financing Activities	(54)	(155)
Effect of Exchange Rates on Cash and Cash Equivalents	(1)	(16)
Net Change in Cash and Cash Equivalents	715	111
Cash and Cash Equivalents at Beginning of Period	854	580
Cash and Cash Equivalents at End of Period	1,569	691
Supplemental Disclosure of Cash Flow Information:
Cash interest paid	372	495
Income taxes paid, net of refunds	26	40
Non-cash Financing Activities:
Capital lease obligations incurred	1	6
Long-term debt conversion into equity	0	333
Accrued interest conversion into equity	$ 0	$ 10