Goodwill and Other Intangible Assets (Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Total	$ 1,165	$ 1,018
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Remaining Amortization Period	42 months	40 months
Gross Carrying Amount	70	54
Accumulated Amortization	27	18
Total	43	36
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Remaining Amortization Period	12 years	13 years
Gross Carrying Amount	1,505	1,227
Accumulated Amortization	409	285
Total	1,096	942
Trade names and associated trademarks
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Remaining Amortization Period	31 months	40 months
Gross Carrying Amount	81	81
Accumulated Amortization	55	41
Total	$ 26	$ 40