Reclassification Out of Accumulated Other Comprehensive Income (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Reclassification out of Accumulated Other Comprehensive Income
Investment income	$ 36,000,000	$ 33,000,000
Provision for income tax	(139,000,000)	(76,000,000)
Product sales revenue	3,008,000,000	3,112,000,000
Cost of product sales	1,296,000,000	1,356,000,000
Accumulated Net Unrealized Investment Gain (Loss)
Reclassification out of Accumulated Other Comprehensive Income
Provision for income tax	(29,000,000)	(18,000,000)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Reclassification out of Accumulated Other Comprehensive Income
Provision for income tax	67,000,000	66,000,000
Accumulated Defined Benefit Plans Adjustment
Reclassification out of Accumulated Other Comprehensive Income
Provision for income tax	61,000,000	61,000,000
Reclassification Out of Accumulated Other Comprehensive Income | Accumulated Net Unrealized Investment Gain (Loss)
Reclassification out of Accumulated Other Comprehensive Income
Investment income	8,000,000
Net of tax	5,000,000
Reclassification Out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Reclassification out of Accumulated Other Comprehensive Income
Provision for income tax	0
Net of tax	2,000,000
Total net gain on derivatives before tax	2,000,000
Foreign Exchange Contract | Reclassification Out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Reclassification out of Accumulated Other Comprehensive Income
Product sales revenue	1,000,000
Cost of product sales	(1,000,000)
Unrealized Gain on Investments | Reclassification Out of Accumulated Other Comprehensive Income | Accumulated Net Unrealized Investment Gain (Loss)
Reclassification out of Accumulated Other Comprehensive Income
Provision for income tax	$ (3,000,000)