Consolidating Financial Information - Condensed Consolidating Statement of Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash Flows from Operating Activities:
Total Cash Flows from Operating Activities	$ (286)	$ (372)
Cash Flows from Investing Activities:
Capital Expenditures	(271)	(253)
Asset Dispositions	1	1
Short Term Securities Acquired	(11)	(12)
Short Term Securities Redeemed	11	0
Capital Contributions and Loans Incurred	0	0
Capital Redemptions and Loans Paid	0	0
Total Cash Flows from Investing Activities	(270)	(264)
Cash Flows from Financing Activities:
Short Term Debt and Overdrafts Incurred	51	26
Short Term Debt and Overdrafts Paid	(82)	(2)
Long Term Debt Incurred	1,838	1,085
Long Term Debt Paid	(1,369)	(822)
Common Stock Issued	9	2
Common Stock Repurchased	(25)	(50)
Common Stock Dividends Paid	(25)	(19)
Capital Contributions and Loans Incurred	0	0
Capital Redemptions and Loans Paid	0	0
Intercompany Dividends Paid	0	0
Transactions with Minority Interests in Subsidiaries	0	(6)
Debt Related Costs and Other Transactions	1	(10)
Total Cash Flows from Financing Activities	398	204
Effect of Exchange Rate Changes on Cash, Cash Equivalents and Restricted Cash	20	28
Net Change in Cash, Cash Equivalents and Restricted Cash	(138)	(404)
Cash, Cash Equivalents and Restricted Cash at Beginning of the Period	1,189	1,502
Cash, Cash Equivalents and Restricted Cash at End of the Period	1,051	1,098
Reportable Legal Entities | Parent Company
Cash Flows from Operating Activities:
Total Cash Flows from Operating Activities	(81)	(315)
Cash Flows from Investing Activities:
Capital Expenditures	(113)	(116)
Asset Dispositions	1	0
Short Term Securities Acquired	0	0
Short Term Securities Redeemed	0
Capital Contributions and Loans Incurred	(23)	(34)
Capital Redemptions and Loans Paid	0	25
Total Cash Flows from Investing Activities	(135)	(125)
Cash Flows from Financing Activities:
Short Term Debt and Overdrafts Incurred	0	0
Short Term Debt and Overdrafts Paid	0	0
Long Term Debt Incurred	1,270	320
Long Term Debt Paid	(655)	(51)
Common Stock Issued	9	2
Common Stock Repurchased	(25)	(50)
Common Stock Dividends Paid	(25)	(19)
Capital Contributions and Loans Incurred	30	100
Capital Redemptions and Loans Paid	(448)	0
Intercompany Dividends Paid	0	0
Transactions with Minority Interests in Subsidiaries		0
Debt Related Costs and Other Transactions	12	(1)
Total Cash Flows from Financing Activities	168	301
Effect of Exchange Rate Changes on Cash, Cash Equivalents and Restricted Cash	0	0
Net Change in Cash, Cash Equivalents and Restricted Cash	(48)	(139)
Cash, Cash Equivalents and Restricted Cash at Beginning of the Period	210	361
Cash, Cash Equivalents and Restricted Cash at End of the Period	162	222
Reportable Legal Entities | Guarantor Subsidiaries
Cash Flows from Operating Activities:
Total Cash Flows from Operating Activities	(4)	2
Cash Flows from Investing Activities:
Capital Expenditures	(49)	(16)
Asset Dispositions	0	0
Short Term Securities Acquired	0	0
Short Term Securities Redeemed	0
Capital Contributions and Loans Incurred	0	0
Capital Redemptions and Loans Paid	0	0
Total Cash Flows from Investing Activities	(49)	(16)
Cash Flows from Financing Activities:
Short Term Debt and Overdrafts Incurred	0	0
Short Term Debt and Overdrafts Paid	0	0
Long Term Debt Incurred	0	0
Long Term Debt Paid	0	0
Common Stock Issued	0	0
Common Stock Repurchased	0	0
Common Stock Dividends Paid	0	0
Capital Contributions and Loans Incurred	23	0
Capital Redemptions and Loans Paid	0	(25)
Intercompany Dividends Paid	0	0
Transactions with Minority Interests in Subsidiaries		0
Debt Related Costs and Other Transactions	0	0
Total Cash Flows from Financing Activities	23	(25)
Effect of Exchange Rate Changes on Cash, Cash Equivalents and Restricted Cash	0	2
Net Change in Cash, Cash Equivalents and Restricted Cash	(30)	(37)
Cash, Cash Equivalents and Restricted Cash at Beginning of the Period	55	67
Cash, Cash Equivalents and Restricted Cash at End of the Period	25	30
Reportable Legal Entities | Non-Guarantor Subsidiaries
Cash Flows from Operating Activities:
Total Cash Flows from Operating Activities	(191)	(43)
Cash Flows from Investing Activities:
Capital Expenditures	(109)	(123)
Asset Dispositions	0	1
Short Term Securities Acquired	(11)	(12)
Short Term Securities Redeemed	11
Capital Contributions and Loans Incurred	(30)	(100)
Capital Redemptions and Loans Paid	448	0
Total Cash Flows from Investing Activities	309	(234)
Cash Flows from Financing Activities:
Short Term Debt and Overdrafts Incurred	51	26
Short Term Debt and Overdrafts Paid	(82)	(2)
Long Term Debt Incurred	568	765
Long Term Debt Paid	(714)	(771)
Common Stock Issued	0	0
Common Stock Repurchased	0	0
Common Stock Dividends Paid	0	0
Capital Contributions and Loans Incurred	0	34
Capital Redemptions and Loans Paid	0	0
Intercompany Dividends Paid	(10)	(11)
Transactions with Minority Interests in Subsidiaries		(6)
Debt Related Costs and Other Transactions	(11)	(12)
Total Cash Flows from Financing Activities	(198)	23
Effect of Exchange Rate Changes on Cash, Cash Equivalents and Restricted Cash	20	26
Net Change in Cash, Cash Equivalents and Restricted Cash	(60)	(228)
Cash, Cash Equivalents and Restricted Cash at Beginning of the Period	924	1,074
Cash, Cash Equivalents and Restricted Cash at End of the Period	864	846
Consolidating Entries and Eliminations
Cash Flows from Operating Activities:
Total Cash Flows from Operating Activities	(10)	(16)
Cash Flows from Investing Activities:
Capital Expenditures	0	2
Asset Dispositions	0	0
Short Term Securities Acquired	0	0
Short Term Securities Redeemed	0
Capital Contributions and Loans Incurred	53	134
Capital Redemptions and Loans Paid	(448)	(25)
Total Cash Flows from Investing Activities	(395)	111
Cash Flows from Financing Activities:
Short Term Debt and Overdrafts Incurred	0	0
Short Term Debt and Overdrafts Paid	0	0
Long Term Debt Incurred	0	0
Long Term Debt Paid	0	0
Common Stock Issued	0	0
Common Stock Repurchased	0	0
Common Stock Dividends Paid	0	0
Capital Contributions and Loans Incurred	(53)	(134)
Capital Redemptions and Loans Paid	448	25
Intercompany Dividends Paid	10	11
Transactions with Minority Interests in Subsidiaries		0
Debt Related Costs and Other Transactions	0	3
Total Cash Flows from Financing Activities	405	(95)
Effect of Exchange Rate Changes on Cash, Cash Equivalents and Restricted Cash	0	0
Net Change in Cash, Cash Equivalents and Restricted Cash	0	0
Cash, Cash Equivalents and Restricted Cash at Beginning of the Period	0	0
Cash, Cash Equivalents and Restricted Cash at End of the Period	$ 0	$ 0