Long-Term Debt - Schedule of Maturities of Long-Term Debt (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Disclosure [Abstract]
Long-term debt, maturities, repayments of principal in next twelve months	$ 1,111
Debt instrument, amortization discount (premium), net year one	(19)
Long-term debt, maturities, repayments of principal in year two	1,326
Debt instrument, amortization discount (premium), net year two	(21)
Long-term debt, maturities, repayments of principal in year three	2,137
Debt instrument, amortization discount (premium), net year three	(19)
Long-term debt, maturities, repayments of principal in year four	2,028
Debt instrument, amortization discount (premium), net fear four	(15)
Long-term debt, maturities, repayments of principal in year five	1,158
Debt instrument, amortization discount (premium), net year five	(12)
Long-term debt, maturities, repayments of principal after year five	1,709
Debt instrument, amortization discount (premium), net after year five	(4)
Long-term debt, gross	9,469us-gaap_DebtInstrumentCarryingAmount	11,228us-gaap_DebtInstrumentCarryingAmount
Amortized of debt discount, net	(90)	(383)
Long-term debt	$ 9,379us-gaap_LongTermDebt	$ 10,845us-gaap_LongTermDebt

Amortization of debt discount net after year five.

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Amortization of debt discount net year five.

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Amortization of debt discount net year four.

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Amortization of debt discount, net year one.

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Amortization of debt discount net year three.

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Amortization of debt discount, net year two.

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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

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-Name Accounting Standards Codification

-Topic 210

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

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The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized.

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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-Name Accounting Standards Codification

-Topic 235

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-Section S99

-Paragraph 3

-Subparagraph (SX 210.12-04.(a))

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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