Goodwill and Intangible Assets Goodwill and Intangible Assets (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 acquisition	Sep. 30, 2012	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Goodwill, Period Increase (Decrease)			$ 155,000,000
Number of Businesses Acquired			2
Finite-Lived Intangible Assets, Gross	0		0		0
Finite-Lived Intangible Assets, Accumulated Amortization	0		0		0
Finite-Lived Intangible Assets, Net	0		0		0
Amortization of Intangible Assets	124,000,000	121,000,000	370,000,000	362,000,000
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	0		0		0
Finite-Lived Intangible Assets, Accumulated Amortization	0		0		0
Finite-Lived Intangible Assets, Net	0		0		0
Noncompete Agreements, Customer Relationships, and Customer Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	0		0		0
Finite-Lived Intangible Assets, Accumulated Amortization	0		0		0
Finite-Lived Intangible Assets, Net	0		0		0
Off-Market Favorable Lease [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	0		0		0
Finite-Lived Intangible Assets, Accumulated Amortization	0		0		0
Finite-Lived Intangible Assets, Net	$ 0		$ 0		$ 0