Stock-Based Compensation - Components of Stock-Based Compensation Expense (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense before income taxes	$ 935	$ 920	$ 836
Income tax benefit	226	230	193
Total stock-based compensation, net of tax	709	690	643
Cost of product sales
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense before income taxes	48	52	61
Cost of services
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense before income taxes	76	74	63
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense before income taxes	357	324	299
Selling, general and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense before income taxes	454	470	413
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense before income taxes	191	262	326
Income tax benefit	56	68	73
Total stock-based compensation, net of tax	135	194	253
Stock Options | Cost of product sales
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense before income taxes	19	22	30
Stock Options | Cost of services
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense before income taxes	15	21	25
Stock Options | Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense before income taxes	75	88	106
Stock Options | Selling, general and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense before income taxes	82	131	165
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense before income taxes	744	658	510
Income tax benefit	170	162	120
Total stock-based compensation, net of tax	574	496	390
Restricted Stock | Cost of product sales
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense before income taxes	29	30	31
Restricted Stock | Cost of services
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense before income taxes	61	53	38
Restricted Stock | Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense before income taxes	282	236	193
Restricted Stock | Selling, general and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense before income taxes	$ 372	$ 339	$ 248