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Investments (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 9 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Sep. 30, 2013
|
Sep. 30, 2013
|
Dec. 31, 2012
|
Sep. 30, 2013
LCH Invetment [Member]
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Dec. 31, 2012
LCH Invetment [Member]
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Sep. 30, 2013
Investment In Dubai Financial Market PJSC [Member]
|
Dec. 31, 2012
Investment In Dubai Financial Market PJSC [Member]
|
Sep. 30, 2013
Foreign Government Debt Securities [Member]
|
Dec. 31, 2012
Foreign Government Debt Securities [Member]
|
Mar. 31, 2012
EMCF [Member]
|
Sep. 30, 2013
EuroCCP [Member]
|
|
| Investments, Debt and Securities [Line Items] | |||||||||||
| Trading securities | $ 145 | $ 145 | $ 201 | $ 102 | $ 134 | ||||||
| Available for sale security, percentage of investment owned | 1.00% | ||||||||||
| Available for sale, cost basis | 18 | 18 | |||||||||
| Available for sale, fair value | 45 | 22 | |||||||||
| Unrealized Holding Gains on Available-For-Sale Investment Securities | 27 | ||||||||||
| Equity method investments | 26 | 26 | 13 | ||||||||
| Expected ownership percentage | 25.00% | ||||||||||
| Other than temporary impairment | 12 | ||||||||||
| Pro forma ownership | 3.70% | ||||||||||
| Carrying cost of Investment | 65 | 37 | |||||||||
| Ownership percentage after capital raise | 5.00% | ||||||||||
| Increase in ownership percentage after capital raise | 1.30% | ||||||||||
| Cash paid for Increase in ownership interest after capital raise | 28 | ||||||||||
| Income Loss From Equity Method Investments | $ 1 | $ 1 |