Accounts Payable and Other Current Liabilities (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Accounts Payable and Other Current Liablities [Line Items]
Compensation and benefits payable	$ 789us-gaap_AccruedEmployeeBenefitsCurrent	$ 821us-gaap_AccruedEmployeeBenefitsCurrent
Accounts payable	344us-gaap_AccountsPayableCurrent	311us-gaap_AccountsPayableCurrent
Property and income tax liabilities	330	290
Accrued interest	265us-gaap_InterestPayableCurrent	243us-gaap_InterestPayableCurrent
Rents and leases	158us-gaap_AccruedRentCurrent	161us-gaap_AccruedRentCurrent
Customer incentives	151	151
Casualty and environmental liabilities	140	145
Other	1,258us-gaap_OtherAccruedLiabilitiesCurrent	1,084us-gaap_OtherAccruedLiabilitiesCurrent
Total	$ 3,435	$ 3,206

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Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due property, state and federal income tax obligations.

+ References

No definition available.

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Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Paragraph 1

-Subparagraph (SX 210.5-02.19,20)

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-Publisher SEC

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Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Subparagraph (SX 210.5-02.19(a))

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Carrying value as of the balance sheet date of obligations, excluding pension and other postretirement benefits, incurred through that date and payable for perquisites provided to employees pertaining to services received from them. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

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-Glossary Current Liabilities

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for contractual rent under lease arrangements. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

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The current portion of aggregate prepayments received from customers for goods or services to be provided in the future, as well as the current portion of money or property received from customers that are to be returned upon satisfactory contract completion or as partial prepayment for goods or services to be provided in the future.

+ References

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Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

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- Definition

Amount of loss contingency liability.

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-Publisher FASB

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-Topic 450

-SubTopic 20

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Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

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