Reclassification Out of Accumulated Other Comprehensive Income (Details) (USD $)	3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012 Accumulated Net Unrealized Investment Gain (Loss)	Jun. 30, 2013 Accumulated Net Unrealized Investment Gain (Loss)	Dec. 31, 2012 Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	Jun. 30, 2013 Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	Dec. 31, 2012 Accumulated Defined Benefit Plans Adjustment	Jun. 30, 2013 Accumulated Defined Benefit Plans Adjustment	Jun. 30, 2013 Reclassification Out of Accumulated Other Comprehensive Income Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	Jun. 30, 2013 Reclassification Out of Accumulated Other Comprehensive Income Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	Jun. 30, 2013 Foreign Exchange Contract Reclassification Out of Accumulated Other Comprehensive Income Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	Jun. 30, 2013 Foreign Exchange Contract Reclassification Out of Accumulated Other Comprehensive Income Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	Jun. 30, 2013 Unrealized Gain (Loss) Reclassification Out of Accumulated Other Comprehensive Income Accumulated Net Unrealized Investment Gain (Loss)	Jun. 30, 2013 Unrealized Gain (Loss) Reclassification Out of Accumulated Other Comprehensive Income Accumulated Net Unrealized Investment Gain (Loss)	Jun. 30, 2013 Unrealized Gain on Investments Reclassification Out of Accumulated Other Comprehensive Income Accumulated Net Unrealized Investment Gain (Loss)	Jun. 30, 2013 Unrealized Gain on Investments Reclassification Out of Accumulated Other Comprehensive Income Accumulated Net Unrealized Investment Gain (Loss)
Reclassification out of Accumulated Other Comprehensive Income
Investment income	$ 34,000,000	$ 26,000,000	$ 67,000,000	$ 55,000,000											$ 6,000,000	$ 13,000,000
Total net gain on derivatives before tax											3,000,000	10,000,000
Net of tax											3,000,000	8,000,000			4,000,000	8,000,000
Product sales revenue	3,258,000,000	3,179,000,000	6,369,000,000	6,248,000,000									6,000,000	16,000,000
Cost of product sales	1,340,000,000	1,254,000,000	2,696,000,000	2,556,000,000									3,000,000	(6,000,000)
Provision for income tax	$ (216,000,000)	$ (214,000,000)	$ (292,000,000)	$ (405,000,000)	$ (37,000,000)	$ (17,000,000)	$ 67,000,000	$ 66,000,000	$ 87,000,000	$ 87,000,000	$ 0	$ (2,000,000)					$ (2,000,000)	$ 5,000,000