Restrictions on Cash and Dividends - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Restricted Cash and Cash Equivalents Items [Line Items]
Banking Subsidiary Reserve Requirement	$ 1,600,000,000	$ 1,500,000,000
Subsidiary Deposit To FRB	942,000,000	1,100,000,000
Dividend Received From Nonbank Companies And Related Subsidiaries	859,000,000	2,000,000,000
Common stock dividends restrictions	the potential increase in its quarterly common stock dividend to $0.12 per share
Redemption of TruPS	750,000,000
Incremental Common Shares Attributable to Conversion of Preferred Stock	18,000,000	36,000,000	36,000,000
Minimum Tier 1 Common Ratio	5.00%
BHC stress test threshold	50,000,000,000
CCAR common stock repurchase authorization
Restricted Cash and Cash Equivalents Items [Line Items]
Stock repurchase authorization amount	984,000,000
Series G Preferred Stock
Restricted Cash and Cash Equivalents Items [Line Items]
Preferred Stock Conversion Value	398,000,000
Incremental Common Shares Attributable to Conversion of Preferred Stock	35,500,000
Series G Preferred Stock | CCAR common stock repurchase authorization
Restricted Cash and Cash Equivalents Items [Line Items]
Stock repurchase authorization amount	550,000,000
Series H Preferred Stock
Restricted Cash and Cash Equivalents Items [Line Items]
Issuance of preferred stock	550,000,000
Series I Preferred Stock
Restricted Cash and Cash Equivalents Items [Line Items]
Issuance of preferred stock	$ 500,000,000