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STOCK-BASED COMPENSATION. (Tables)
3 Months Ended
Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Rollforward of stock options
The following table summarizes the status of, and changes in, our stock options during the first quarter of 2017.
 
 
Options
 
Weighted-
average
exercise
price
Outstanding at December 31, 2016
24,364,322

 
$
61.90

Exercised
(1,552,287
)
 
$
49.11

Forfeited
(13,765
)
 
$
74.51

Expired
(32,437
)
 
$
75.84

Outstanding at March 31, 2017
22,765,833

 
$
62.75

Exercisable at March 31, 2017
15,947,980

 
$
57.92

Rollforward of nonvested restricted shares and restricted stock units
The following table summarizes the status of, and changes in, our nonvested restricted shares and restricted stock units during the first quarter of 2017.
 
Restricted
shares
 
Restricted
stock
units
 
Weighted-average
fair value
Nonvested at December 31, 2016
931,508

 
4,634,461

 
$
72.19

Time-based grants

 
39,558

 
$
66.77

Vested
(1,420
)
 
(5,650
)
 
$
78.67

Forfeited
(3,626
)
 
(15,449
)
 
$
72.92

Nonvested at March 31, 2017
926,462

 
4,652,920

 
$
72.14

Future stock-based compensation expense
The following table presents the compensation expense (in millions) to be recognized over the remaining vesting periods of the stock-based awards outstanding at March 31, 2017. Estimated future compensation expense will change to reflect future option grants, future awards of unrestricted shares and restricted stock units, changes in the probability of performance thresholds being met, and adjustments for actual forfeitures.
 
Second quarter 2017
$
37.6

Third quarter 2017
37.8

Fourth quarter 2017
33.8

2018
85.7

2019 through 2022
72.9

Total
$
267.8