Nature of Operations and Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Organization And Summary Of Significant Accounting Policies [Line Items]
Percentage of revenues generated from customers in the United States	47.00%	46.00%	45.00%
Impairment of goodwill	$ 0	$ 0	$ 0
Advertising and promotional expenses	3,868,000,000	3,186,000,000	3,004,000,000
Net cash provided by operating activities	36,036,000,000	26,572,000,000	23,024,000,000
Net cash used in financing activities	$ (8,332,000,000)	(4,225,000,000)	(2,087,000,000)
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2016-09
Organization And Summary Of Significant Accounting Policies [Line Items]
Net cash provided by operating activities		548,000,000	648,000,000
Net cash used in financing activities		$ 548,000,000	648,000,000
Patent Royalty Licensing Agreement
Organization And Summary Of Significant Accounting Policies [Line Items]
Impairment of intangible asset			$ 378,000,000
Building
Organization And Summary Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives, up to	25 years
Information technology assets
Organization And Summary Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives, up to	7 years
Minimum
Organization And Summary Of Significant Accounting Policies [Line Items]
Acquired intangible assets, estimated useful lives	1 year
Maximum
Organization And Summary Of Significant Accounting Policies [Line Items]
Acquired intangible assets, estimated useful lives	12 years