Related Parties (Due To/From Related Parties) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2015
Related Party Transaction [Line Items]
Related party transaction, other than tax obligation due to or from related party, cash settlement period			60 days
EMC
Related Party Transaction [Line Items]
Due to related parties	$ (85)	$ (76)	$ (85)
Due from related parties	(77)	(125)	(77)
Due (to) from related parties, net	(8)	49	$ (8)
Income tax due (to) from related parties	$ 6	$ (40)