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Quarterly report pursuant to Section 13 or 15(d)

STOCK-BASED COMPENSATION PLANS - NONVESTED SHARES (Details)

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STOCK-BASED COMPENSATION PLANS - NONVESTED SHARES (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Nonvested shares Ìý Ìý
Additional information Ìý Ìý
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted under the Stock Incentive Plan $ 40 Ìý
Weighted-average period over which cost is expected to be recognized 2 years 4 months 24 days Ìý
Value of share awards vested $ 15 $ 20
Performance Awards Ìý Ìý
STOCK-BASED COMPENSATION PLANS Ìý Ìý
Weighted-average volatility rate 39.30% 30.00%
Risk-free interest rate (as a percent) 0.90% 0.70%
Performance Awards | Minimum Ìý Ìý
Additional information Ìý Ìý
Performance period 2 years Ìý
Performance Awards | Maximum Ìý Ìý
Additional information Ìý Ìý
Performance period 3 years Ìý
Equity Awards Ìý Ìý
Shares Ìý Ìý
Nonvested at the beginning of the period (in shares) 1,854,000 Ìý
Granted (in shares) 1,871,000 Ìý
Vested (in shares) (652,000) Ìý
Forfeited (in shares) (3,000) Ìý
Nonvested at the end of the period (in shares) 3,070,000 Ìý
Weighted Average Grant-Date Fair Value Ìý Ìý
Nonvested at the beginning of the period (in dollars per share) $ 19.97 Ìý
Granted (in dollars per share) 9.23 Ìý
Vested (in dollars per share) 19.86 Ìý
Forfeited (in dollars per share) 22.25 Ìý
Nonvested at the end of the period (in dollars per share) $ 13.44 Ìý
Liability Awards Ìý Ìý
Shares Ìý Ìý
Nonvested at the beginning of the period (in shares) 475,000 Ìý
Granted (in shares) 693,000 Ìý
Vested (in shares) (229,000) Ìý
Forfeited (in shares) (13,000) Ìý
Nonvested at the end of the period (in shares) 926,000 Ìý
Weighted Average Grant-Date Fair Value Ìý Ìý
Nonvested at the beginning of the period (in dollars per share) $ 21.37 Ìý
Granted (in dollars per share) 8.86 Ìý
Vested (in dollars per share) 20.65 Ìý
Forfeited (in dollars per share) 18.95 Ìý
Nonvested at the end of the period (in dollars per share) $ 12.22 Ìý
Restricted stock units Ìý Ìý
Shares Ìý Ìý
Vested (in shares) (60,948) Ìý
Additional information Ìý Ìý
Units vested but not yet issued 454,900 Ìý