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Stock Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Share-based Compensation [Abstract]  
Nonvested Incentive/Performance Unit Awards and Restricted Share/Restricted Share Unit Awards - Rollforward
Table 75: Nonvested Incentive/Performance Unit Awards and Restricted Share/Restricted Share Unit Awards Rollforward (a)
Shares in millions
Nonvested Incentive/Performance Units Shares

Weighted-Average Grant Date Fair Value

Nonvested Restricted Share/Restricted Share Units

Weighted-Average Grant Date Fair Value

December 31, 2017
2

$
94.29

3

$
95.64

Granted (b)
—

$
133.74

1

$
152.25

Vested/Released (b)
(1
)
$
89.56

(1
)
$
92.28

December 31, 2018
1

$
104.02

3

$
115.57

(a)
Forfeited awards during 2018 were insignificant.
(b)
Includes adjustments for achieving specific performance goals for Incentive/Performance Unit Share Awards granted in prior periods.