Intangible Assets (Details 2) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Intangible assets with indefinite lives
Gross carrying amount	$ 30	$ 30
Impairment charges	0	0
Net	30	30
Trade names [Member]
Intangible assets with indefinite lives
Gross carrying amount	22	22
Impairment charges	0	0
Net	22	22
Other intangible assets [Member]
Intangible assets with indefinite lives
Gross carrying amount	8	8
Impairment charges	0	0
Net	$ 8	$ 8