Consolidating Financial Information (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash Flows from Operating Activities:
Total Cash Flows from Operating Activities	$ (262)	$ (1,543)
Cash Flows from Investing Activities:
Capital Expenditures	(204)	(229)
Asset Dispositions	1	2
Decrease in Restricted Cash	2	4
Short Term Securities Acquired	0	(25)
Short Term Securities Redeemed	21	35
Capital Contributions and Loans Incurred		0
Capital Redemptions and Loans Paid		0
Other Transactions	0	2
Total Cash Flows from Investing Activities	(180)	(211)
Cash Flows from Financing Activities:
Short Term Debt and Overdrafts Incurred	16us-gaap_ProceedsFromShortTermDebt	13us-gaap_ProceedsFromShortTermDebt
Short Term Debt and Overdrafts Paid	(22)us-gaap_RepaymentsOfShortTermDebt	0us-gaap_RepaymentsOfShortTermDebt
Long Term Debt Incurred	616	1,104
Long Term Debt Paid	(628)us-gaap_RepaymentsOfLongTermDebt	(272)us-gaap_RepaymentsOfLongTermDebt
Common Stock Issued	2	24
Common Stock Repurchased	(1)	(32)
Common Stock Dividends Paid	(16)us-gaap_PaymentsOfDividendsCommonStock	(12)us-gaap_PaymentsOfDividendsCommonStock
Preferred Stock Dividends Paid	0	(7)
Capital Contributions and Loans Incurred		0
Capital Redemptions and Loans Paid		0
Intercompany Dividends Paid	0gt_InterCompanyDividendPaid	0gt_InterCompanyDividendPaid
Transactions with Minority Interests in Subsidiaries	1	23
Total Cash Flows from Financing Activities	(34)	795
Effect of Exchange Rate Changes on Cash and Cash Equivalents	(72)	(184)
Net Change in Cash and Cash Equivalents	(548)	(1,143)
Cash and Cash Equivalents at Beginning of the Period	2,161	2,996
Cash and Cash Equivalents at End of the Period	1,613	1,853
Parent Company
Cash Flows from Operating Activities:
Total Cash Flows from Operating Activities	(76)	(1,132)
Cash Flows from Investing Activities:
Capital Expenditures	(60)	(86)
Asset Dispositions	0	0
Decrease in Restricted Cash	0	0
Short Term Securities Acquired		0
Short Term Securities Redeemed	0	0
Capital Contributions and Loans Incurred		(187)
Capital Redemptions and Loans Paid		364
Other Transactions		1
Total Cash Flows from Investing Activities	(60)	92
Cash Flows from Financing Activities:
Short Term Debt and Overdrafts Incurred	14	0
Short Term Debt and Overdrafts Paid	(7)	(47)
Long Term Debt Incurred	141	300
Long Term Debt Paid	(341)	(202)
Common Stock Issued	2	24
Common Stock Repurchased	(1)	(32)
Common Stock Dividends Paid	(16)	(12)
Preferred Stock Dividends Paid		(7)
Capital Contributions and Loans Incurred		452
Capital Redemptions and Loans Paid		(209)
Intercompany Dividends Paid	0	0
Transactions with Minority Interests in Subsidiaries	0	0
Total Cash Flows from Financing Activities	(208)	267
Effect of Exchange Rate Changes on Cash and Cash Equivalents	0	0
Net Change in Cash and Cash Equivalents	(344)	(773)
Cash and Cash Equivalents at Beginning of the Period	674	1,269
Cash and Cash Equivalents at End of the Period	330	496
Guarantor Subsidiaries
Cash Flows from Operating Activities:
Total Cash Flows from Operating Activities	(33)	(36)
Cash Flows from Investing Activities:
Capital Expenditures	(11)	(5)
Asset Dispositions	0	0
Decrease in Restricted Cash	0	0
Short Term Securities Acquired		0
Short Term Securities Redeemed	0	0
Capital Contributions and Loans Incurred		0
Capital Redemptions and Loans Paid		0
Other Transactions		0
Total Cash Flows from Investing Activities	(11)	(5)
Cash Flows from Financing Activities:
Short Term Debt and Overdrafts Incurred	7	9
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		0
Capital Redemptions and Loans Paid		0
Intercompany Dividends Paid	0	0
Transactions with Minority Interests in Subsidiaries	0	0
Total Cash Flows from Financing Activities	7	9
Effect of Exchange Rate Changes on Cash and Cash Equivalents	(7)	(2)
Net Change in Cash and Cash Equivalents	(44)	(34)
Cash and Cash Equivalents at Beginning of the Period	89	94
Cash and Cash Equivalents at End of the Period	45	60
Non-Guarantor Subsidiaries
Cash Flows from Operating Activities:
Total Cash Flows from Operating Activities	(141)	(349)
Cash Flows from Investing Activities:
Capital Expenditures	(136)	(139)
Asset Dispositions	1	2
Decrease in Restricted Cash	2	4
Short Term Securities Acquired		(25)
Short Term Securities Redeemed	21	35
Capital Contributions and Loans Incurred		(452)
Capital Redemptions and Loans Paid		209
Other Transactions		1
Total Cash Flows from Investing Activities	(112)	(365)
Cash Flows from Financing Activities:
Short Term Debt and Overdrafts Incurred	16	51
Short Term Debt and Overdrafts Paid	(36)	0
Long Term Debt Incurred	475	804
Long Term Debt Paid	(287)	(70)
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		187
Capital Redemptions and Loans Paid		(364)
Intercompany Dividends Paid	(9)	(25)
Transactions with Minority Interests in Subsidiaries	1	23
Total Cash Flows from Financing Activities	158	560
Effect of Exchange Rate Changes on Cash and Cash Equivalents	(65)	(182)
Net Change in Cash and Cash Equivalents	(160)	(336)
Cash and Cash Equivalents at Beginning of the Period	1,398	1,633
Cash and Cash Equivalents at End of the Period	1,238	1,297
Consolidating Entries and Eliminations
Cash Flows from Operating Activities:
Total Cash Flows from Operating Activities	(12)	(26)
Cash Flows from Investing Activities:
Capital Expenditures	3	1
Asset Dispositions	0	0
Decrease in Restricted Cash	0	0
Short Term Securities Acquired		0
Short Term Securities Redeemed	0	0
Capital Contributions and Loans Incurred		639
Capital Redemptions and Loans Paid		(573)
Other Transactions		0
Total Cash Flows from Investing Activities	3	67
Cash Flows from Financing Activities:
Short Term Debt and Overdrafts Incurred	(21)	(47)
Short Term Debt and Overdrafts Paid	21	47
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		(639)
Capital Redemptions and Loans Paid		573
Intercompany Dividends Paid	9	25
Transactions with Minority Interests in Subsidiaries	0	0
Total Cash Flows from Financing Activities	9	(41)
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

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow for a borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

+ References

+ Details

Name:	us-gaap_RepaymentsOfShortTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	dei_LegalEntityAxis=us-gaap_ConsolidationEliminationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=us-gaap_GuarantorSubsidiariesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=us-gaap_NonGuarantorSubsidiariesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=us-gaap_ParentCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: