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Fair Value Estimates for Financial Instruments Excluding Short Term Financial Assets and Liabilities and Financial Instruments Recorded at Fair Value (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Carrying Amount
Financial Assets:
Securities held to maturity	$ 15,108	$ 17,762
Loans to banking clients - net	9,812	8,725
Loans held for sale	70	185
Financial Liabilities:
Long-term debt	2,001	2,006
Fair Value
Financial Assets:
Securities held to maturity	15,539	17,848
Loans to banking clients - net	9,671	8,469
Loans held for sale	73	194
Financial Liabilities:
Long-term debt	$ 2,159	$ 2,116

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investments in debt securities which are categorized as held-to-maturity and that have scheduled maturities more than one year from the balance sheet date or operating cycle, if longer; such investments are normally measured at amortized cost (carrying value) unless circumstances indicate that the value to be recovered from the investment is less than its carried amount. The held-to-maturity category is for those securities that the Company has the positive intent and ability to hold until maturity.

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents loan receivable as presented on the statement of financial position which may include mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts, or any other loans which are due the Company as of the balance sheet date.

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