Consolidating Financial Information (Details 2) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash Flows from Operating Activities:
Total Cash Flows from Operating Activities	$ 274	$ (1,134)
Cash Flows from Investing Activities:
Capital Expenditures	(448)	(441)
Asset Dispositions	8	5
Decrease (Increase) in Restricted Cash	(6)	3
Short Term Securities Acquired	(49)	(41)
Short Term Securities Redeemed	21	46
Capital Contributions and Loans Incurred	0	0
Capital Redemptions and Loans Paid		0
Other Transactions	5	7
Total Cash Flows from Investing Activities	(469)	(421)
Cash Flows from Financing Activities:
Short Term Debt and Overdrafts Incurred	49	18
Short Term Debt and Overdrafts Paid	(43)	(24)
Long Term Debt Incurred	1,116	1,314
Long Term Debt Paid	(1,312)	(823)
Common Stock Issued	18	31
Common Stock Repurchased	(52)	(65)
Common Stock Dividends Paid	(32)	(26)
Preferred Stock Dividends Paid	0	(15)
Capital Contributions and Loans Incurred	0	0
Capital Redemptions and Loans Paid		0
Intercompany Dividends Paid	0	0
Transactions with Minority Interests in Subsidiaries	(1)	(34)
Debt Related Costs and Other Transactions	(10)	0
Total Cash Flows from Financing Activities	(267)	376
Effect of Exchange Rate Changes on Cash and Cash Equivalents	(61)	(180)
Net Change in Cash and Cash Equivalents	(523)	(1,359)
Cash and Cash Equivalents at Beginning of the Period	2,161	2,996
Cash and Cash Equivalents at End of the Period	1,638	1,637
Parent Company
Cash Flows from Operating Activities:
Total Cash Flows from Operating Activities	231	(1,112)
Cash Flows from Investing Activities:
Capital Expenditures	(184)	(148)
Asset Dispositions	0	2
Decrease (Increase) in Restricted Cash	0	0
Short Term Securities Acquired	0	0
Short Term Securities Redeemed	0	0
Capital Contributions and Loans Incurred	(12)	(211)
Capital Redemptions and Loans Paid		364
Other Transactions	0	1
Total Cash Flows from Investing Activities	(196)	8
Cash Flows from Financing Activities:
Short Term Debt and Overdrafts Incurred	43	3
Short Term Debt and Overdrafts Paid	(5)	(6)
Long Term Debt Incurred	455	401
Long Term Debt Paid	(658)	(405)
Common Stock Issued	18	31
Common Stock Repurchased	(52)	(65)
Common Stock Dividends Paid	(32)	(26)
Preferred Stock Dividends Paid		(15)
Capital Contributions and Loans Incurred	0	452
Capital Redemptions and Loans Paid		(209)
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	(232)	161
Effect of Exchange Rate Changes on Cash and Cash Equivalents	0	0
Net Change in Cash and Cash Equivalents	(197)	(943)
Cash and Cash Equivalents at Beginning of the Period	674	1,269
Cash and Cash Equivalents at End of the Period	477	326
Guarantor Subsidiaries
Cash Flows from Operating Activities:
Total Cash Flows from Operating Activities	(14)	(15)
Cash Flows from Investing Activities:
Capital Expenditures	(16)	(9)
Asset Dispositions	0	1
Decrease (Increase) in Restricted Cash	0	0
Short Term Securities Acquired	0	0
Short Term Securities Redeemed	0	0
Capital Contributions and Loans Incurred	0	0
Capital Redemptions and Loans Paid		0
Other Transactions	0	0
Total Cash Flows from Investing Activities	(16)	(8)
Cash Flows from Financing Activities:
Short Term Debt and Overdrafts Incurred	5	6
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
Preferred Stock Dividends Paid		0
Capital Contributions and Loans Incurred	12	0
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	0
Total Cash Flows from Financing Activities	17	6
Effect of Exchange Rate Changes on Cash and Cash Equivalents	(6)	0
Net Change in Cash and Cash Equivalents	(19)	(17)
Cash and Cash Equivalents at Beginning of the Period	89	94
Cash and Cash Equivalents at End of the Period	70	77
Non-Guarantor Subsidiaries
Cash Flows from Operating Activities:
Total Cash Flows from Operating Activities	75	31
Cash Flows from Investing Activities:
Capital Expenditures	(251)	(286)
Asset Dispositions	8	2
Decrease (Increase) in Restricted Cash	(6)	3
Short Term Securities Acquired	(49)	(41)
Short Term Securities Redeemed	21	46
Capital Contributions and Loans Incurred	0	(452)
Capital Redemptions and Loans Paid		209
Other Transactions	5	6
Total Cash Flows from Investing Activities	(272)	(513)
Cash Flows from Financing Activities:
Short Term Debt and Overdrafts Incurred	49	18
Short Term Debt and Overdrafts Paid	(86)	(27)
Long Term Debt Incurred	661	913
Long Term Debt Paid	(654)	(418)
Common Stock Issued	0	0
Common Stock Repurchased	0	0
Common Stock Dividends Paid	0	0
Preferred Stock Dividends Paid		0
Capital Contributions and Loans Incurred	0	211
Capital Redemptions and Loans Paid		(364)
Intercompany Dividends Paid	(15)	(36)
Transactions with Minority Interests in Subsidiaries	(1)	(34)
Debt Related Costs and Other Transactions	(9)
Total Cash Flows from Financing Activities	(55)	263
Effect of Exchange Rate Changes on Cash and Cash Equivalents	(55)	(180)
Net Change in Cash and Cash Equivalents	(307)	(399)
Cash and Cash Equivalents at Beginning of the Period	1,398	1,633
Cash and Cash Equivalents at End of the Period	1,091	1,234
Consolidating Entries and Eliminations
Cash Flows from Operating Activities:
Total Cash Flows from Operating Activities	(18)	(38)
Cash Flows from Investing Activities:
Capital Expenditures	3	2
Asset Dispositions	0	0
Decrease (Increase) in Restricted Cash	0	0
Short Term Securities Acquired	0	0
Short Term Securities Redeemed	0	0
Capital Contributions and Loans Incurred	12	663
Capital Redemptions and Loans Paid		(573)
Other Transactions	0	0
Total Cash Flows from Investing Activities	15	92
Cash Flows from Financing Activities:
Short Term Debt and Overdrafts Incurred	(48)	(9)
Short Term Debt and Overdrafts Paid	48	9
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
Preferred Stock Dividends Paid		0
Capital Contributions and Loans Incurred	(12)	(663)
Capital Redemptions and Loans Paid		573
Intercompany Dividends Paid	15	36
Transactions with Minority Interests in Subsidiaries	0	0
Debt Related Costs and Other Transactions	0
Total Cash Flows from Financing Activities	3	(54)
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