v2.4.0.8

Clearing Operations (Schedule of Derivative Contracts Outstanding) (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2013 contract | Sep. 30, 2012 contract
--- | --- | ---
Clearing Operations [Line Items] |  |  |  |
Market value of derivative contracts | $ 1,359 |  |  |
Total Number of Cleared Contracts | 74,849,697 |  | 81,799,340 |
Commodity forwards and options [Member] |  |  |  |
Clearing Operations [Line Items] |  |  |  |
Market value of derivative contracts | 769 | [1],[2] |  |
Total Number of Cleared Contracts | 624,714 | [3] | 644,589 | [3]
Fixed-income options and futures [Member] |  |  |  |
Clearing Operations [Line Items] |  |  |  |
Market value of derivative contracts | 297 | [2],[4] |  |
Total Number of Cleared Contracts | 21,131,906 |  | 26,586,488 |
Stock options and futures [Member] |  |  |  |
Clearing Operations [Line Items] |  |  |  |
Market value of derivative contracts | 125 | [2],[4] |  |
Total Number of Cleared Contracts | 23,200,139 |  | 21,735,025 |
Index options and futures [Member] |  |  |  |
Clearing Operations [Line Items] |  |  |  |
Market value of derivative contracts | $ 168 | [2],[4] |  |
Total Number of Cleared Contracts | 29,892,938 |  | 32,833,238 |
[1] | We determined the fair value of our forward contracts using standard valuation models that were based on market-based observable inputs including LIBOR rates and the spot price of the underlying instrument.
[2] | We determined the fair value of our option contracts using standard valuation models that were based on market-based observable inputs including implied volatility, interest rates and the spot price of the underlying instrument.
[3] | The total volume in cleared power related to commodity contracts was 1,247 Terawatt hours (TWh) for the nine months ended September 30, 2013 and 1,250 TWh for the nine months ended September 30, 2012.
[4] | We determined the fair value of our futures contracts based upon quoted market prices and average quoted market yields.

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