Stockholders' Equity (Schedule of Components of Other Comprehensive Income (Loss), Net) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Stockholders' Equity Note [Abstract]
Unrealized gain (loss) on marketable securities, gross amount	$ 0	$ 0
Unrealized gain (loss) on marketable securities, income tax (provision) benefit	0	0
Unrealized gain (loss) on marketable securities, net amount	0	0
Foreign currency translation, gross amount	(3)	(31)
Foreign currency translation, income tax (provision) benefit	8	0
Foreign currency translation, net amount	5	(31)
Gain (loss) on interest rate swaps, gross amount	0	2
Gain (loss) on interest rate swaps, income tax (provision) benefit	(3)	(1)
Gain (loss) on interest rate swaps, net amount	(3)	1
Pension and postretirement benefits, gross amount	(19)	0
Pension and postretirement benefits, income tax (provision) benefit	7	0
Pension and postretirement benefits, net amount	(12)	0
Total other comprehensive income (loss), gross amount	(22)	(29)
Total other comprehensive income (loss), income tax (provision) benefit	12	(1)
Total other comprehensive income (loss), net of tax	$ (10)	$ (30)