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Shareholders' Equity - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended			0 Months Ended	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 2013 Capital Plan [Member]	Mar. 26, 2014 2014 Capital Plan [Member]	Mar. 31, 2014 2014 Capital Plan [Member] Minimum [Member]	Mar. 31, 2014 2014 Capital Plan [Member] Maximum [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Repurchase of common stock			$ 141
Stock repurchase program expiration date			March 31, 2014
Stock repurchase program authorized amount				$ 542
Stock repurchase program commencement date				April 1, 2014
Common stock dividend declared	$ 0.055	$ 0.050			$ 0.055	$ 0.065

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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