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STOCK-BASED COMPENSATION. (Tables)
 12 Months Ended
Dec. 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 2017.
 
Options
 
Weighted-
average
exercise
price
 
Weighted-average
remaining
contractual
term in
years
Outstanding at December 31, 2016
24,364,322

 
$
61.90

 
 
Exercised
(8,977,164
)
 
$
53.04

 
 
Forfeited
(126,404
)
 
$
75.16

 
 
Expired
(39,631
)
 
$
76.06

 
 
Outstanding at December 31, 2017
15,221,123

 
$
66.98

 
5.1
Exercisable at December 31, 2017
11,140,190

 
$
63.79

 
4.5
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 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
17,022

 
2,026,176

 
$
100.24

Performance-based grants
—

 
114,454

 
$
101.79

Vested (value at vest date was $164.5 million)
(455,958
)
 
(1,111,857
)
 
$
71.77

Forfeited
(19,457
)
 
(106,323
)
 
$
72.32

Nonvested at December 31, 2017
473,115

 
5,556,911

 
$
82.37
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 December 31, 2017. Estimated future compensation expense will change to reflect future grants changes in the probability of performance thresholds being met, and adjustments for actual forfeitures.

First quarter 2018
$
47.3

Second quarter 2018
46.7

Third quarter 2018
46.0

Fourth quarter 2018
40.3

Total 2018
180.3

2019 through 2023
176.1

Total
$
356.4