Accumulated Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Total, Beginning Balance	$ (164)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(44)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	5
Other comprehensive income (loss)	(39)	(12)
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Net	43
Total, Ending Balance	(223)
Reclassifications Out Of Accumulated Other Comprehensive Income [Abstract]
Product sales	930	1,104
Reclassifications before income tax	(247)	(327)
Provision (benefit) for income taxes	(51)	(96)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassifications Out Of Accumulated Other Comprehensive Income [Abstract]
Provision (benefit) for income taxes	(2)
Reclassifications during the period	5
Cash flow hedging activities [Member]
Total, Beginning Balance	(1)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0
Other comprehensive income (loss)	0
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Net	0
Total, Ending Balance	(1)
Foreign currency translation [Member]
Total, Beginning Balance	128
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(44)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0
Other comprehensive income (loss)	(44)
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Net	(20)
Total, Ending Balance	64
Accumulated Other Comprehensive Income (Loss) [Member]
Other comprehensive income (loss)	(39)
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Net	(20)
Pension and other postretirement benefits [Member]
Total, Beginning Balance	(291)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	5
Other comprehensive income (loss)	5
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Net	0
Total, Ending Balance	(286)
Pension and other postretirement benefits [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassifications Out Of Accumulated Other Comprehensive Income [Abstract]
Amortization of prior service cost (credit) included in net periodic benefit cost	(2)
Amortization of actuarial (gain) loss included in net periodic benefit cost	9
Reclassifications before income tax	7
Parent [Member]
Other comprehensive income (loss)	(39)
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Net	$ (92)