Franchises, Goodwill and Other Intangible Assets Indefinite and Finite-Lived Intangibles (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Indefinite-lived intangible assets: [Abstract]
Goodwill	$ 1,168	$ 1,168
Total indefinite lived intangible assets	7,337	7,337
Finite-lived intangible assets [Abstract]
Gross carrying amount	2,786	2,767
Accumulated amortization	1,776	1,571
Net carrying amount	1,010	1,196
Customer Relationships [Member]
Finite-lived intangible assets [Abstract]
Gross carrying amount	2,616	2,616
Accumulated amortization	1,700	1,511
Net carrying amount	916	1,105
Other intangible assets [Member]
Finite-lived intangible assets [Abstract]
Gross carrying amount	170	151
Accumulated amortization	76	60
Net carrying amount	94	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