|
Securities - Certain Corporate and Strategic Investments (Details) (USD $)
Share data in Billions, unless otherwise specified |
Sep. 30, 2012
|
Dec. 31, 2011
|
|---|---|---|
| Equity Method Investments and Joint Ventures [Abstract] | ||
| Equity Method Investment, Ownership Percentage | 49.00% | |
|
First Data Corporation [Member]
|
||
| Equity Method Investments and Joint Ventures [Abstract] | ||
| Equity Method Investment, Ownership Percentage | 49.00% | |
| Equity Method Investments | $ 3,300,000,000 | $ 3,400,000,000 |
|
Common Stock [Member] | China Construction Bank [Member]
|
||
| Cost Method Investments [Abstract] | ||
| Investment Owned, Balance, Shares | 2.0 | 2.0 |
| Cost method investment ownership percentage | 1.00% | 1.00% |
| Cost Method Investment, Cost Basis | 716,000,000 | 716,000,000 |
| Cost Method Investments, Fair Value Disclosure | 1,228,000,000 | 1,400,000,000 |
| Cost-method Investments, Aggregate Carrying Amount | $ 1,200,000,000 | $ 716,000,000 |
| X | ||||||||||
|
- Definition
Cost Method Investment, Cost Basis No definition available.
|
| X | ||||||||||
|
- Definition
Cost method investment ownership percentage. No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
This element represents the aggregate carrying amount of all cost-method investments held by the Company. Generally, such investments do not have readily determinable fair values and are not required to be accounted for by the equity method. The carrying amount of such securities equates to cost, adjusted for other-than-temporary impairment. The cost method and lower-of-cost or market, an adaptation of the cost method, is generally followed for most investments in noncontrolled corporations, in some corporate joint ventures, and to a lesser extent in unconsolidated subsidiaries, particularly foreign. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- 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 investments accounted for under the cost method of accounting as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Balance held at close of period in number of shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|