Stockholders' Equity (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Stockholders' Equity (Textuals) [Abstract]
Proceeds from issuance of common stock	$ 10	$ 14
Statement [Line Items]
Total, Beginning Balance	(341)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(60)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	6
Other comprehensive income (loss)	(89)	(39)
Total, Ending Balance	(395)
Reclassifications Out Of Accumulated Other Comprehensive Income [Abstract]
Product sales	519	930
Reclassifications before income tax	(43)	(247)
Provision (benefit) for income taxes	(30)	(51)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Statement [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	6
Reclassifications Out Of Accumulated Other Comprehensive Income [Abstract]
Provision (benefit) for income taxes	(3)
Cash flow hedging activities [Member]
Statement [Line Items]
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
Total, Ending Balance	(1)
Foreign currency translation [Member]
Statement [Line Items]
Total, Beginning Balance	31
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(60)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0
Other comprehensive income (loss)	(60)
Total, Ending Balance	(29)
Accumulated Other Comprehensive Income (Loss) [Member]
Statement [Line Items]
Other comprehensive income (loss)	(54)
Pension and other postretirement benefits [Member]
Statement [Line Items]
Total, Beginning Balance	(371)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	6
Other comprehensive income (loss)	6
Total, Ending Balance	(365)
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	11
Reclassifications before income tax	9
Parent [Member]
Statement [Line Items]
Other comprehensive income (loss)	$ (54)