Intangible Assets (Components Of Intangible Assets) (Details) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Gross carrying amount, goodwill	$ 1,483	$ 1,481
Gross carrying amount, trademarks	731	731
Gross carrying amount, amortized intangible assets	816	798
Accumulated amortization, amortized intangible assets	382	358
Net carrying amount, amortized intangible assets	434	440
Franchise Agreements [Member]
Gross carrying amount, amortized intangible assets	634	634
Accumulated amortization, amortized intangible assets	333	318
Net carrying amount, amortized intangible assets	301	316
Other Intangible Assets [Member]
Gross carrying amount, amortized intangible assets	182	164
Accumulated amortization, amortized intangible assets	49	40
Net carrying amount, amortized intangible assets	$ 133	$ 124