Income Taxes (Narrative) (Detail) - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Non Variable Interest Entities [Line Items]
Deferred income taxes, net	$ 1,000,000,000	$ 1,000,000,000
Non U.S. deferred tax liability	33,000,000
Valuation allowance	0	$ 0
NOL carryforward	3,100,000,000
Alternative minimum tax credit carryforward	$ 22,000,000