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Investment gains/losses and other-than-temporary impairment losses on investments - Narrative (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Investment and other gains / losses [Line Items]
Other-than-temporary impairment of securities	$ 337	$ 506
Cost of investment in gain position	52,657		49,610
Gross unrealized gains	36,732		28,773
Equity Securities and Other Investments [Member] \| Equity Securities [Member]
Investment and other gains / losses [Line Items]
Other-than-temporary impairment of securities		506
Equity Securities and Other Investments [Member] \| Equity Securities [Member] \| Wells Fargo and Company [Member]
Investment and other gains / losses [Line Items]
Other-than-temporary impairment of securities		337
Number of shares in loss position before OTTI adjustment		103.6
Cost of investment in loss position before OTTI adjustment		3,621
Number of shares in gain position		255.4
Cost of investment in gain position		4,394
Gross unrealized gains		$ 3,704

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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- Definition

The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.

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