Stockholders' Equity Reclassification Out of Accumulated Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Investment income	$ 123	$ 128	$ 115
Income tax provision	(868)	(772)	(918)
Product revenues	14,051	13,690	13,061
Cost of product sales	(5,738)	(5,650)	(5,259)
Net income	2,894	3,093	2,886
Interest expense	(147)	(156)	(79)
Income before provision for income taxes	3,762	3,865	3,804
Accumulated Net Unrealized Investment Gain (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income tax provision	(31)	(18)	(37)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income tax provision	64	66	67
Accumulated Defined Benefit Plans Adjustment
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income tax provision	70	61	87
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income tax provision	3	6
Net income	(6)	(9)
Other Cost and Expense, Operating	(9)	(15)
Foreign Exchange Contract | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income tax provision	0	(2)
Product revenues	39	12
Cost of product sales	(10)	0
Net income	18	10
Income before provision for income taxes	18	12
Interest rate swap contract | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain Loss Interest Rate Swap
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Interest expense	(11)	0
Unrealized Gain on Investments [Member] | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Unrealized Investment Gain (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Investment income	62	17
Income tax provision	(23)	(6)
Net income	$ 39	$ 11