Franchises, Goodwill and Other Intangible Assets Indefinite and Finite-Lived Intangibles (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Indefinite-lived intangible assets: [Abstract]
Goodwill	$ 1,168us-gaap_Goodwill	$ 1,168us-gaap_Goodwill
Total indefinite lived intangible assets	7,337	7,337
Finite-lived intangible assets [Abstract]
Gross carrying amount	2,780	2,767
Accumulated amortization	1,640	1,571
Net carrying amount	1,140us-gaap_FiniteLivedIntangibleAssetsNet	1,196us-gaap_FiniteLivedIntangibleAssetsNet
Customer Relationships [Member]
Finite-lived intangible assets [Abstract]
Gross carrying amount	2,616	2,616
Accumulated amortization	1,574	1,511
Net carrying amount	1,042	1,105
Other intangible assets [Member]
Finite-lived intangible assets [Abstract]
Gross carrying amount	164	151
Accumulated amortization	66	60
Net carrying amount	98	91
Franchises [Member]
Indefinite-lived intangible assets: [Abstract]
Indefinite lived intangible assets, gross	6,006	6,006
Goodwill [Member]
Indefinite-lived intangible assets: [Abstract]
Goodwill	1,168	1,168
Trademarks [Member]
Indefinite-lived intangible assets: [Abstract]
Indefinite lived intangible assets, gross	159	159
Other intangible assets [Member]
Indefinite-lived intangible assets: [Abstract]
Indefinite lived intangible assets, gross	$ 4	$ 4

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Sum of the carrying amounts as of the balance sheet date of intangible assets having a projected indefinite period of benefit.

+ References

No definition available.

+ Details

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

+ Details

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- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

+ Details

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- Definition

Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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