Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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+ Details

Goodwill - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2012 Global Banking [Member]	Jun. 30, 2012 Private Banking reporting units [Member]
Goodwill And Intangible Assets [Line Items]
Goodwill	$ 2,228	$ 2,228	$ 2,228
Goodwill accumulated impairment losses	54
Goodwill allocated to retail branch disposal group		$ 398
The carrying value including goodwill of our Global Banking and Markets reporting unit as a percent of its fair value.				91.00%	93.00%