Intangible Assets (Schedule of Finite-Lived Intangible Assets by Major Class) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets
Net finite-lived intangible assets, beginning of period	$ 712	$ 741
Amortization	(30)	(29)
Net finite-lived intangible assets, end of period	682	712
Finite-Lived Intangible Assets, Future Amortization
Future annual amortization of finite intangible assets	30
Customer Relations
Finite-Lived Intangible Assets
Net finite-lived intangible assets, beginning of period	655	681
Amortization	(26)	26
Net finite-lived intangible assets, end of period	629	655
Finite-Lived Intangible Assets, Future Amortization
Average remaining amortization periods, years	24 years 0 months 0 days
Trade Names
Finite-Lived Intangible Assets
Net finite-lived intangible assets, beginning of period	57	60
Amortization	(4)	3
Net finite-lived intangible assets, end of period	$ 53	$ 57
Finite-Lived Intangible Assets, Future Amortization
Average remaining amortization periods, years	16 years 0 months 0 days