Investment Securities (Contractual maturities) (Details) (USD $) In Millions	Jun. 30, 2011
Amortized Cost [Member]
Investment [Line Items]
2011	$ 2,958
2012-2015	7,298
2016-2020	4,730
2021 and later	17,811
Estimated Fair Value [Member]
Investment [Line Items]
2011	2,985
2012-2015	7,580
2016-2020	4,922
2021 and later	$ 18,958

This item represents debt securities (excluding mortgage-backed and asset-backed securities), at cost, net of adjustments made for accretion, amortization, other-than-temporary impairments, and hedging, if any, which are expected to mature after five years and through ten years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

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- Definition

This item represents debt securities (excluding mortgage-backed and asset-backed securities), at cost, net of adjustments made for accretion, amortization, other-than-temporary impairments, and hedging, if any, which are expected to mature after one year and through five years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

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- Definition

This item represents debt securities (excluding mortgage-backed and asset-backed securities), at cost, net of adjustments made for accretion, amortization, other-than-temporary impairments, and hedging, if any, which are expected to mature after ten years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

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- Definition

This item represents debt securities (excluding mortgage-backed and asset-backed securities), at cost, net of adjustments made for accretion, amortization, other-than-temporary impairments, and hedging, if any, which are expected to mature within one year of the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

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- Definition

Line items represent reporting concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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