Litigation and Regulatory Matters - Additional Information (Detail) (USD $)	12 Months Ended		1 Months Ended		12 Months Ended		1 Months Ended		11 Months Ended			0 Months Ended	1 Months Ended			93 Months Ended	1 Months Ended		12 Months Ended	1 Months Ended	3 Months Ended	12 Months Ended			12 Months Ended
	Dec. 31, 2013	Feb. 28, 2013 servicers	Nov. 30, 2012 Esslinger [Member] appeal	Oct. 31, 2012 DeKalb County vs. HSBC North America Holdings [Member] county	Dec. 31, 2013 Obligations to Repurchase Mortage Loans [Member]	Dec. 31, 2013 Obligations to Repurchase Real Estate Secured Receivables [Member]	Nov. 30, 2013 Debt Cancellation Litigation [Member]	Oct. 31, 2013 Debt Cancellation Litigation [Member] plaintiff	May 31, 2011 Debt Cancellation Litigation [Member] class_action	Dec. 31, 2013 Minimum [Member] Obligations to Repurchase Mortage Loans [Member]	Dec. 31, 2013 Maximum [Member] Obligations to Repurchase Mortage Loans [Member]	Oct. 17, 2013 Securities Litigation [Member]	Dec. 31, 2011 Securities Litigation [Member] claim	Dec. 31, 2013 Securities Litigation [Member]	Aug. 31, 2002 Securities Litigation [Member] state	Mar. 31, 2013 Cards Litigation [Member] class_action	Apr. 30, 2012 Debt Cancellation Litigation [Member] Hawaii Attorney General [Member] company	Jan. 31, 2013 Telephone Consumer Protection Act Litigation [Member] claim	Dec. 31, 2013 Telephone Consumer Protection Act Litigation [Member] TCPA [Member]	Feb. 29, 2012 Foreclosure Litigation [Member] servicer	Dec. 31, 2011 Foreclosure Litigation [Member]	Dec. 31, 2013 Foreclosure Litigation [Member]	Dec. 31, 2012 Foreclosure Litigation [Member]	Feb. 28, 2013 Foreclosure Litigation [Member] state	Feb. 28, 2013 Foreclosure Litigation [Member] HSBC North America [Member]	Dec. 31, 2012 Foreclosure Litigation [Member] HSBC North America [Member]
Loss Contingencies [Line Items]
Number of states in settlement															46
Total claims of loss													45,921
Aggregate amount of claims					$ 500,000,000								$ 2,200,000,000
Portion of reasonable possible loss not accrued for						5,500,000,000				0	62,000,000
Litigation judgment claims												2,500,000,000
Claims still open to special court												527,000,000
Possible future expenses related to amount of damages														3,500,000,000
Class actions filed									8							4
Loss Contingency, Number of Additional Plaintiffs								2
Loss Contingency, Damages Awarded, Value								24,000,000
Litigation Settlement, Amount							2,000,000
Number of appeals voluntarily dismissed			1
Number of credit card companies have lawsuits		12															7
Number of counties filing lawsuit				3
Number of claims																		2
Statutory damages for each violation (usd per violation)																			500
Statutory damages for each willful violation (usd per violation)																			1,500
Cash payments mortgage servicers would pay in excess		9,300,000,000
Cash payment into a fund hat will be used to make payments to borrowers																									96,000,000
Recorded expenses in period																							85,000,000			104,000,000
Term in Which Entity Must Continue To Make Payments or Provide Borrowing Assistance	2 years
Number of states in settlement with U.S. mortgage servicers																								49
Number of U.S. mortgage servicers																				5
Accrual																					157,000,000
Decrease in accrual																						$ (14,000,000)