Loans - Impaired Commercial Loans Considered as TDR Loans (Detail) (Commercial Loan [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Amount with Impairment Reserves	$ 165		$ 250
Amount without Impairment Reserves	316		447
Total Impaired Commercial Loans	481	[1],[2]	697	[1],[2]
Impairment Reserve	40		96
Construction and Other Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Amount with Impairment Reserves	122		192
Amount without Impairment Reserves	211		305
Total Impaired Commercial Loans	333	[1],[2]	497	[1],[2]
Impairment Reserve	32		86
Business and Corporate Banking [Member]
Financing Receivable, Impaired [Line Items]
Amount with Impairment Reserves	28		57
Amount without Impairment Reserves	12		49
Total Impaired Commercial Loans	40	[1],[2]	106	[1],[2]
Impairment Reserve	3		10
Global Banking [Member]
Financing Receivable, Impaired [Line Items]
Amount with Impairment Reserves	14		0
Amount without Impairment Reserves	51		18
Total Impaired Commercial Loans	65	[1],[2]	18	[1],[2]
Impairment Reserve	5		0
Other Commercial [Member]
Financing Receivable, Impaired [Line Items]
Amount with Impairment Reserves	1		1
Amount without Impairment Reserves	42		75
Total Impaired Commercial Loans	43	[1],[2]	76	[1],[2]
Impairment Reserve	$ 0		$ 0

[1] The impaired commercial loan balances included in the table above reflect the current carrying amount of the loan and includes all basis adjustments, such as partial charge-offs, unamortized deferred fees and costs on originated loans and any premiums or discounts. The following table reflects the unpaid principal balance of impaired commercial loans included in the table above:At December 31,2013 2012 (in millions)Construction and other real estate$380 $552Business and corporate banking91 157Global banking123 18Other commercial47 79Total$641 $806

[2] Includes impaired commercial loans which are also considered TDR Loans as follows:At December 31,2013 2012 (in millions)Construction and other real estate$292 $343Business and corporate banking21 86Global banking51 —Other commercial25 31Total$389 $460