Goodwill and Acquisition-Related Intangibles (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill, net	$ 4,362,000,000		$ 4,362,000,000		$ 4,362,000,000
Accumulated impairment of goodwill	90,000,000		90,000,000		$ 90,000,000
Goodwill impairment loss			0	$ 0
Amortization of acquisition-related intangibles	$ 80,000,000	$ 80,000,000	$ 160,000,000	$ 161,000,000