Long-Term Debt (Schedule of Debt) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Debt	$ 16,969us-gaap_DebtAndCapitalLeaseObligations	$ 16,916us-gaap_DebtAndCapitalLeaseObligations
Current maturities of long-term debt	(229)	(235)
Long-term debt	16,740	16,681
Secured Debt [Member] \| Credit Facility, Term Loan A [Member]
Debt Instrument [Line Items]
Debt	925	950
Secured Debt [Member] \| Credit Facility, Term Loan D [Member]
Debt Instrument [Line Items]
Debt	4,544	4,555
Secured Debt [Member] \| Credit Facility, Term Loan E [Member]
Debt Instrument [Line Items]
Debt		1,660
Secured Debt [Member] \| Credit Facility, Term Loan F [Member]
Debt Instrument [Line Items]
Debt	1,700
Line of Credit [Member] \| Credit Facility, Revolving Credit Loans [Member]
Debt Instrument [Line Items]
Debt	62
Senior Notes [Member] \| Senior Notes at 8.0, Due 2019 [Member]
Debt Instrument [Line Items]
Debt	2,017	2,018
Senior Notes [Member] \| Senior Notes at 7.125, Due 2020 [Member]
Debt Instrument [Line Items]
Debt	1,200	1,200
Senior Notes [Member] \| Senior Notes at 6.875, Due 2022 [Member]
Debt Instrument [Line Items]
Debt	3,000	3,000
Senior Secured Notes [Member] \| Senior Secured Notes At 5.125 Due 2018 [Member]
Debt Instrument [Line Items]
Debt	1,600	1,600
Senior Secured Notes [Member] \| Senior Secured Notes at 5.125, Due 2021 [Member]
Debt Instrument [Line Items]
Debt	1,000	1,000
Receivables Facility [Member] \| Receivables Facility, Name [Member]
Debt Instrument [Line Items]
Debt	623	614
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Debt	215	228
Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt	$ 83	$ 91

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.13,16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section H

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Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer.

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