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 (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Goodwill And Intangible Assets [Line Items]
Goodwill	$ 2,228	$ 2,228	$ 2,228
Goodwill accumulated impairment losses	54
Global Banking [Member]
Goodwill And Intangible Assets [Line Items]
Goodwill	612
The carrying value including goodwill of our Global Banking and Markets reporting unit as a percent of its fair value.	97.00%
Global Private Banking [Member]
Goodwill And Intangible Assets [Line Items]
Goodwill	$ 415
The carrying value including goodwill of our Global Banking and Markets reporting unit as a percent of its fair value.	50.00%