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Equity - Common Stock (Details) - shares
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Equity [Abstract]      
Shares authorized (in shares) 1,800,000,000 1,800,000,000.0 800,000,000
Shares outstanding at end of period (in shares) 633,471,000   484,819,000
Shares held in treasury (in shares) 2,113,000   1,113,000