Consolidating Financial Information - Consolidating Statement of Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash Flows from Operating Activities:
Total Cash Flows from Operating Activities	$ (381)	$ (262)
Cash Flows from Investing Activities:
Capital Expenditures	(253)	(204)
Asset Dispositions	1	1
Decrease in Restricted Cash	7	2
Short Term Securities Acquired	(12)	0
Short Term Securities Redeemed	0	21
Capital Contributions and Loans Incurred	0
Capital Redemptions and Loans Paid	0
Total Cash Flows from Investing Activities	(257)	(180)
Cash Flows from Financing Activities:
Short Term Debt and Overdrafts Incurred	26	16
Short Term Debt and Overdrafts Paid	(2)	(22)
Long Term Debt Incurred	1,085	616
Long Term Debt Paid	(822)	(628)
Common Stock Issued	2	2
Common Stock Repurchased	(50)	(1)
Common Stock Dividends Paid	(19)	(16)
Capital Contributions and Loans Incurred	0
Capital Redemptions and Loans Paid	0
Intercompany Dividends Paid	0	0
Transactions with Minority Interests in Subsidiaries	(6)	(1)
Debt Related Costs and Other Transactions	(1)	0
Total Cash Flows from Financing Activities	213	(34)
Effect of Exchange Rate Changes on Cash and Cash Equivalents	28	(72)
Net Change in Cash and Cash Equivalents	(397)	(548)
Cash and Cash Equivalents at Beginning of the Period	1,476	2,161
Cash and Cash Equivalents at End of the Period	1,079	1,613
Parent Company
Cash Flows from Operating Activities:
Total Cash Flows from Operating Activities	(316)	(76)
Cash Flows from Investing Activities:
Capital Expenditures	(113)	(60)
Asset Dispositions	0	0
Decrease in Restricted Cash	0	0
Short Term Securities Acquired	0
Short Term Securities Redeemed		0
Capital Contributions and Loans Incurred	(34)
Capital Redemptions and Loans Paid	25
Total Cash Flows from Investing Activities	(122)	(60)
Cash Flows from Financing Activities:
Short Term Debt and Overdrafts Incurred	0	14
Short Term Debt and Overdrafts Paid	(1)	(7)
Long Term Debt Incurred	320	141
Long Term Debt Paid	(51)	(341)
Common Stock Issued	2	2
Common Stock Repurchased	(50)	(1)
Common Stock Dividends Paid	(19)	(16)
Capital Contributions and Loans Incurred	100
Capital Redemptions and Loans Paid	0
Intercompany Dividends Paid	0	0
Transactions with Minority Interests in Subsidiaries	0	0
Debt Related Costs and Other Transactions	(1)
Total Cash Flows from Financing Activities	300	(208)
Effect of Exchange Rate Changes on Cash and Cash Equivalents	0	0
Net Change in Cash and Cash Equivalents	(138)	(344)
Cash and Cash Equivalents at Beginning of the Period	354	674
Cash and Cash Equivalents at End of the Period	216	330
Guarantor Subsidiaries
Cash Flows from Operating Activities:
Total Cash Flows from Operating Activities	3	(33)
Cash Flows from Investing Activities:
Capital Expenditures	(19)	(11)
Asset Dispositions	0	0
Decrease in Restricted Cash	0	0
Short Term Securities Acquired	0
Short Term Securities Redeemed		0
Capital Contributions and Loans Incurred	0
Capital Redemptions and Loans Paid	0
Total Cash Flows from Investing Activities	(19)	(11)
Cash Flows from Financing Activities:
Short Term Debt and Overdrafts Incurred	1	7
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	0
Capital Redemptions and Loans Paid	(25)
Intercompany Dividends Paid	0	0
Transactions with Minority Interests in Subsidiaries	0	0
Debt Related Costs and Other Transactions	0
Total Cash Flows from Financing Activities	(24)	7
Effect of Exchange Rate Changes on Cash and Cash Equivalents	2	(7)
Net Change in Cash and Cash Equivalents	(38)	(44)
Cash and Cash Equivalents at Beginning of the Period	70	89
Cash and Cash Equivalents at End of the Period	32	45
Non-Guarantor Subsidiaries
Cash Flows from Operating Activities:
Total Cash Flows from Operating Activities	(52)	(141)
Cash Flows from Investing Activities:
Capital Expenditures	(123)	(136)
Asset Dispositions	1	1
Decrease in Restricted Cash	7	2
Short Term Securities Acquired	(12)
Short Term Securities Redeemed		21
Capital Contributions and Loans Incurred	(100)
Capital Redemptions and Loans Paid	0
Total Cash Flows from Investing Activities	(227)	(112)
Cash Flows from Financing Activities:
Short Term Debt and Overdrafts Incurred	26	16
Short Term Debt and Overdrafts Paid	(2)	(36)
Long Term Debt Incurred	765	475
Long Term Debt Paid	(771)	(287)
Common Stock Issued	0	0
Common Stock Repurchased	0	0
Common Stock Dividends Paid	0	0
Capital Contributions and Loans Incurred	34
Capital Redemptions and Loans Paid	0
Intercompany Dividends Paid	(11)	(9)
Transactions with Minority Interests in Subsidiaries	(6)	(1)
Debt Related Costs and Other Transactions	(3)
Total Cash Flows from Financing Activities	32	158
Effect of Exchange Rate Changes on Cash and Cash Equivalents	26	(65)
Net Change in Cash and Cash Equivalents	(221)	(160)
Cash and Cash Equivalents at Beginning of the Period	1,052	1,398
Cash and Cash Equivalents at End of the Period	831	1,238
Consolidating Entries and Eliminations
Cash Flows from Operating Activities:
Total Cash Flows from Operating Activities	(16)	(12)
Cash Flows from Investing Activities:
Capital Expenditures	2	3
Asset Dispositions	0	0
Decrease in Restricted Cash	0	0
Short Term Securities Acquired	0
Short Term Securities Redeemed		0
Capital Contributions and Loans Incurred	134
Capital Redemptions and Loans Paid	(25)
Total Cash Flows from Investing Activities	111	3
Cash Flows from Financing Activities:
Short Term Debt and Overdrafts Incurred	(1)	(21)
Short Term Debt and Overdrafts Paid	1	21
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	(134)
Capital Redemptions and Loans Paid	25
Intercompany Dividends Paid	11	9
Transactions with Minority Interests in Subsidiaries	0	0
Debt Related Costs and Other Transactions	3
Total Cash Flows from Financing Activities	(95)	9
Effect of Exchange Rate Changes on Cash and Cash Equivalents	0	0
Net Change in Cash and Cash Equivalents	0	0
Cash and Cash Equivalents at Beginning of the Period	0	0
Cash and Cash Equivalents at End of the Period	$ 0	$ 0