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Preferred and Common Stock - Schedule of Total Compensation Expense Recognized for All Stock Options and Awards (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock option grants	$ 27	$ 34	$ 44
Stock award grants	40	49	40
Total compensation expense before income taxes	67	83	84
Benefit for income taxes	21	27	27
Total compensation expense, net of income taxes	$ 46	$ 56	$ 57

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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