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Equity
 12 Months Ended
Dec. 31, 2014
Equity

Note 13: Equity

Common Stock

In the aggregate, holders of our Class A common stock have 66 2/3% of the voting power of our common stock and holders of our Class B common stock have 331/3% of the voting power of our common stock. Our Class A Special common stock is generally nonvoting. Each share of our Class B common stock is entitled to 15 votes. The number of votes held by each share of our Class A common stock depends on the number of shares of Class A and Class B common stock outstanding at any given time. The 331/3% aggregate voting power of our Class B common stock cannot be diluted by additional issuances of any other class of common stock. Our Class B common stock is convertible, share for share, into Class A or Class A Special common stock, subject to certain restrictions.

Shares of Common Stock Outstanding
(in millions)AA SpecialB
Balance, December 31, 2011 2,095 601 9
Stock compensation plans 24 3 -
Repurchases and retirements of common stock - (96) -
Employee stock purchase plans 3 - -
Balance, December 31, 2012 2,122 508 9
Stock compensation plans 14 - -
Repurchases and retirements of common stock - (49) -
Employee stock purchase plans 2 - -
Balance, December 31, 2013 2,138 459 9
Stock compensation plans 13 - -
Repurchases and retirements of common stock (22) (59) -
Employee stock purchase plans 2 - -
Balance, December 31, 2014 2,131 400 9

Share Repurchases

As of December 31, 2014, we had $3.25 billion of availability remaining under the $7.5 billion share repurchase authorization approved by our Board of Directors in 2014.

In February 2015, our Board of Directors increased our share repurchase program authorization to $10 billion, which does not have an expiration date. Under this authorization, we may repurchase shares in the open market or in private transactions.

Share Repurchases
Year ended December 31 (in millions)201420132012
Cash consideration$ 4,251 $ 2,000 $ 3,000
Shares repurchased 81 49 96

Accumulated Other Comprehensive Income (Loss)
December 31 (in millions)20142013
Unrealized gains (losses) on marketable securities$ 1 $ 67
Deferred gains (losses) on cash flow hedges (4) (45)
Unrecognized gains (losses) on employee benefit obligations (68) 71
Cumulative translation adjustments (75) (37)
Accumulated other comprehensive income (loss), net of deferred taxes$ (146)$ 56