|
Fair Value Measurements (Details) (USD $)
|
6 Months Ended | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Jun. 30, 2014
|
Dec. 31, 2013
|
Jun. 30, 2014
Fair Value, Inputs, Level 1 [Member]
|
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
|
Jun. 30, 2014
Fair Value, Inputs, Level 2 [Member]
|
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
|
Dec. 31, 2013
Short-term Investments [Member]
|
Dec. 31, 2013
Restricted Cash And Investments [Member]
|
Jun. 30, 2014
Senior Notes [Member]
|
Jun. 30, 2014
|
Jun. 30, 2014
Cetip, S.A. [Member]
|
Jun. 30, 2014
NYSE Euronext [Member]
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||||
| Long-term investment in equity securities | $ 557,000,000 | $ 324,000,000 | $ 557,000,000 | $ 324,000,000 | $ 0 | $ 0 | ||||||
| U.S. Treasury securities | 100,000,000 | 100,000,000 | 0 | |||||||||
| Mutual Funds | 26,000,000 | 33,000,000 | 26,000,000 | 33,000,000 | 0 | 0 | ||||||
| Foreign exchange derivative contracts | 4,000,000 | 0 | 4,000,000 | |||||||||
| Total assets at fair value | 583,000,000 | 461,000,000 | 583,000,000 | 457,000,000 | 0 | 4,000,000 | ||||||
| Narrative [Abstract] | ||||||||||||
| Senior Notes | 1,390,000,000 | 2,170,000,000 | ||||||||||
| Fair value of senior notes | 1,460,000,000 | 2,190,000,000 | ||||||||||
| Ownership percentage | 12.00% | 6.00% | ||||||||||
| Available-for-sale securities, noncurrent | 450,000,000 | 107,000,000 | ||||||||||
| Available-for-sale Securities, Gross Unrealized Gain (Loss) | 126,000,000 | 8,000,000 | ||||||||||
| Equity method investments, fair value | 100,000,000 | 37,000,000 | 63,000,000 | |||||||||
| Total fair value of cost and equity method investments | $ 24,000,000 | $ 177,000,000 | ||||||||||