Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets - Narrative (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2012	Jun. 30, 2011
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 10	$ 14	$ 22	$ 24	$ 28	$ 10
Amortization expense of intangible assets next 12 months			22
Finite-Lived Intangible Assets, Amortization Expense, Year Two			22
Finite-Lived Intangible Assets, Amortization Expense, Year Three			18
Finite-Lived Intangible Assets, Amortization Expense, Year Four			15
Finite-Lived Intangible Assets, Amortization Expense, Year Five			$ 12