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Consolidated Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2016
Dec. 31, 2015
Statement of Financial Position [Abstract]    
Preferred Stock, Par Value (in dollars per share) $ 0.01 $ 0.01
Preferred Stock, Shares Authorized (in shares) 200,000,000 200,000,000
Preferred Stock, Shares Outstanding (in shares) 0 0
Preferred Stock, Shares Outstanding (in shares) 0 0
Common Stock, Par Value (in dollars per share) $ 0.01 $ 0.01
Common Stock, Shares Authorized (in shares) 600,000,000 600,000,000
Common Stock, Shares Issued (in shares) 431,000,000 430,000,000
Treasury Stock, Shares Authorized (in shares) 103,000,000 106,000,000