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Share-Based Incentive Compensation
 3 Months Ended
Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-Based Incentive Compensation
SHARE-BASED INCENTIVE COMPENSATION

The following information relates to fully vested stock option awards at March 31, 2018:
 
                                           Stock Options
 
Number
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Contractual
Life
Remaining
 
Aggregate
Intrinsic
Value
($ in millions)
Vested at end of period (1)
 
6,207,090

 
$
98.23

 
6.6 years
 
$
253

Exercisable at end of period
 
3,696,007

 
$
84.13

 
5.2 years
 
$
202

_________________________________________________________
(1)
Represents awards for which the requisite service has been rendered, including those that are retirement eligible.

The total compensation cost for all share-based incentive compensation awards recognized in earnings was $44 million and $42 million for the three months ended March 31, 2018 and 2017, respectively.  The related tax benefits recognized in the consolidated statement of income were $8 million and $14 million for the three months ended March 31, 2018 and 2017, respectively.

The total unrecognized compensation cost related to all nonvested share-based incentive compensation awards at March 31, 2018 was $233 million, which is expected to be recognized over a weighted-average period of 2.2 years.