Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Fully amortized intangible assets written-off	$ 2,600
Patents and developed technology
Finite-Lived Intangible Assets [Line Items]
Weighted-average useful life	4 years 6 months 21 days
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted-average useful life	2 years 4 months 1 day
Trade names and other
Finite-Lived Intangible Assets [Line Items]
Weighted-average useful life	4 years 7 months 28 days
Acquisition-related intangible assets
Finite-Lived Intangible Assets [Line Items]
Amortization expense of acquisition-related intangible assets	$ 833	$ 892	$ 1,079
Patent licensing royalty asset
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible asset			$ 378