Reclassification Out of Accumulated Other Comprehensive Income (Details) (USD $)	3 Months Ended		6 Months Ended			12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Accumulated Net Unrealized Investment Gain (Loss)	Dec. 31, 2013 Accumulated Net Unrealized Investment Gain (Loss)	Jun. 30, 2014 Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	Dec. 31, 2013 Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	Jun. 30, 2014 Accumulated Defined Benefit Plans Adjustment	Dec. 31, 2013 Accumulated Defined Benefit Plans Adjustment	Jun. 30, 2014 Foreign Exchange Contract Reclassification Out of Accumulated Other Comprehensive Income Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	Jun. 30, 2014 Foreign Exchange Contract Reclassification Out of Accumulated Other Comprehensive Income Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	Jun. 30, 2014 Unrealized Gain on Investments Reclassification Out of Accumulated Other Comprehensive Income Accumulated Net Unrealized Investment Gain (Loss)	Jun. 30, 2014 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	$ 35,000,000	$ 34,000,000	$ 71,000,000	$ 67,000,000									$ 9,000,000	$ 17,000,000
Provision for income tax	(187,000,000)	(216,000,000)	(326,000,000)	(292,000,000)	(61,000,000)	(18,000,000)	66,000,000	66,000,000	61,000,000	61,000,000	0	0	(3,000,000)	(6,000,000)
Net of tax											1,000,000	3,000,000	6,000,000	11,000,000
Product sales revenue	3,319,000,000	3,258,000,000	6,327,000,000	6,369,000,000							2,000,000	3,000,000
Cost of product sales	(1,372,000,000)	(1,340,000,000)	(2,668,000,000)	(2,696,000,000)							(1,000,000)	0
Total net gain on derivatives before tax											$ 1,000,000	$ 3,000,000