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Borrowings and Deposits - Related Party (Details) (USD $)
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3 Months Ended | 3 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|---|
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Mar. 31, 2013
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Mar. 31, 2013
Extendible One-Year Revolving Credit Facility
Revolving Credit Facility
Bank of America
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Mar. 31, 2013
Revolving Unsecured Line of Credit Maturing February 2014
Revolving Credit Facility
Bank of America
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Dec. 31, 2012
Revolving Unsecured Line of Credit Maturing February 2014
Revolving Credit Facility
Bank of America
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Mar. 31, 2012
Senior And Subordinated Debt
Merrill Lynch Pierce Fenner & Smith Incorporated
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Mar. 31, 2013
Revolving Unsecured Line of Credit Maturing November 2013
Merrill Lynch Pierce Fenner & Smith Incorporated
Revolving Credit Facility
Bank of America
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Dec. 31, 2012
Revolving Unsecured Line of Credit Maturing November 2013
Merrill Lynch Pierce Fenner & Smith Incorporated
Revolving Credit Facility
Bank of America
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Mar. 31, 2013
Revolving 364-day Unsecured Line of Credit Maturing August 2013
Merrill Lynch Pierce Fenner & Smith Incorporated
Revolving Credit Facility
Bank of America
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Dec. 31, 2012
Revolving 364-day Unsecured Line of Credit Maturing August 2013
Merrill Lynch Pierce Fenner & Smith Incorporated
Revolving Credit Facility
Bank of America
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| Debt Instrument [Line Items] | |||||||||
| Debt securities guaranteed by Bank of America | $ 7,200,000,000 | ||||||||
| Maximum borrowing capacity under line of credit | 75,000,000,000 | 25,000,000,000 | 4,000,000,000 | 15,000,000,000 | |||||
| Amount outstanding under line of credit | 0 | 0 | 0 | 0 | 900,000,000 | 900,000,000 | |||
| Early repayment of subordinated notes | 1,200,000,000 | ||||||||
| Gain on retirement of subordinated notes | $ 328,000,000 | ||||||||
| Debt Instrument, Automatic Extension Period | 1 year | 1 year | |||||||
| Debt Instrument, Cancellation Notice, Period | 45 days | 45 days | |||||||