Income Taxes (Narrative) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Non Variable Interest Entities [Line Items]
Federal statutory rate	35.00%	35.00%	35.00%
Net deferred tax asset	$ 1,100,000,000
Valuation allowance	93,000,000	146,000,000
Increase in deferred tax asset	61,000,000
Decrease accumulated other comprehensive income taxes	5,000,000
Decrease in income tax receivable	6,000,000
Increase in net income (loss)	60,000,000	1,000,000
Capital loss carryforward	0
NOL carryforward	2,800,000,000
Non Variable Interest Entities [Member]
Non Variable Interest Entities [Line Items]
Valuation allowance	93,000,000	146,000,000
Valuation Allowance Deferred Tax Asset Change In Amount	$ 53,000,000