Preferred and Common Stock - Schedule of Activity for Stock Options (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Equity [Abstract]
Number of options, Outstanding beginning of year	45.0
Number of options, Granted	8.0
Number of options, Exercised	(1.6)
Number of options, Expired or forfeited	(6.1)
Number of options, Outstanding end of year	45.3
Weighted average exercise price, Outstanding beginning of year	$ 12.58
Weighted average exercise price, granted	$ 8.88
Weighted average exercise price, exercised	$ 8.32
Weighted average exercise price, expired or forfeited	$ 22.13
Weighted average exercise price Outstanding, end of year	$ 10.78