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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
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CONDENSED CONSOLIDATED BALANCE SHEETS |  |
Senior notes, unamortized discount (in dollars) | $ 16 | $ 15
Class A Shares |  |
Shares outstanding |  |
Shares outstanding | 136,046,637 | 133,833,637
Class B Shares |  |
Shares outstanding |  |
Shares outstanding | 469,983,136 | 472,196,136

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