Goodwill and Other Intangible Assets (Other Intangible Assets) (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Goodwill and Other Intangible Assets Disclosure [Abstract]
Intangible Assets, Gross carrying amount	$ 1,499	$ 1,502
Accumulated amortization	(1,064)	(1,009)
Intangible Assets, Net Carrying Amount	$ 435	$ 493