Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended				12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012	Dec. 31, 2009	Dec. 31, 2012 Domestic Country [Member]	Dec. 31, 2012 State and Local Jurisdiction [Member]	Dec. 31, 2012 Foreign Country [Member]
Operating Loss Carryforwards [Line Items]
Approximate undistributed foreign earnings			$ 2,900,000,000
Net operating loss					9,000,000	1,400,000,000	250,000,000
Operating loss carryforward year of expiration					2030	2032	2031
Tax credit carryforward						22,000,000	23,000,000
Tax credit carryforward year of expiration						2026	2031
Capital loss carry forward utilized	257,000,000		223,000,000				19,000,000
Other attributes carryforwards							14,000,000
Italian tax incentive program recognized tax benefit		120,000,000
Company recognized tax benefit in continuing operations	25,000,000	42,000,000
Company recognized a tax benefit in discontinued operations		134,000,000
Total unrecognized tax benefits	153,000,000	510,000,000	191,000,000	999,000,000
Tax benefits affecting effective tax rate			52,000,000
Unrecognized tax benefit impact in the next twelve months			51,000,000
Payment of interest accrued	$ 74,000,000		$ 80,000,000