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Stock Compensation Plans and Other Compensation Arrangements (Tables)
 12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Allocation of Stock-based Compensation Expense by Plan
Stock-based compensation expense and the related tax benefits for the years ended December 31, 2015, 2014 and 2013, are as follows:
 
Year Ended December 31
$ in millions
2015
 
2014
 
2013
Stock-based compensation expense:
 
 
 
 
 
Stock options
$
—

 
$
—

 
$
4

Stock awards
99

 
134

 
140

Total stock-based compensation expense
99

 
134

 
144

Tax benefits from the exercise of stock options
6

 
29

 
25

Tax benefits from the issuance of stock awards
97

 
52

 
16

Total tax benefits recognized for stock-based compensation
$
103

 
$
81

 
$
41
Stock Award Rollforward Activity
Stock award activity for the years ended December 31, 2015, 2014 and 2013, is presented in the table below. Vested awards do not include any adjustments to reflect the final performance measure for issued shares.
 
 
Stock
Awards
(in thousands)
 
Weighted-
Average
Grant Date
Fair Value
 
Weighted-
Average
Remaining
Contractual
Term (in years)
Outstanding at January 1, 2013
 
3,478

 
$
61

 
1.6
Granted
 
1,577

 
64

 
 
Vested
 
(1,323
)
 
60

 
 
Forfeited
 
(312
)
 
62

 
 
Outstanding at December 31, 2013
 
3,420

 
$
61

 
1.5
Granted
 
763

 
118

 
 
Vested
 
(1,217
)
 
58

 
 
Forfeited
 
(158
)
 
70

 
 
Outstanding at December 31, 2014
 
2,808

 
$
77

 
1.1
Granted
 
539

 
166

 
 
Vested
 
(1,691
)
 
62

 
 
Forfeited
 
(70
)
 
108

 
 
Outstanding at December 31, 2015
 
1,586

 
$
122

 
1.2
Nonvested Restricted Stock Shares Activity [Table Text Block]
The following table presents the number of RSRs and RPSRs granted to employees under the company's long-term incentive stock plan and the grant date aggregate fair value of those stock awards for the periods presented:
 
 
Year Ended December 31
in millions
 
2015
2014
2013
RSRs granted
 
0.2

0.2

0.5

RPSRs granted
 
0.4

0.6

1.1

Grant date aggregate fair value
 
$
89

$
90

$
101
Shares Issued in Settlement of Fully Vested Stock Awards
The following table presents the gross number of shares issued to employees in settlement of fully vested stock awards and the total fair value at issuance and on the grant date for the periods presented:
 
 
Year Ended December 31
in millions
 
2015
2014
2013
Gross number of shares issued(1)
 
2.6

2.6

3.4

Fair value at issuance(2)
 
$
434

$
305

$
226

Grant date fair value(2)
 
143

80

105
Cash Units and Cash Performance Units Aggregate Payout Amount [Table Text Block]

The following table presents the minimum and maximum aggregate payout amounts related to those cash awards granted for the periods presented:
 
 
Year Ended December 31
$ in millions
 
2015
2014
2013
Minimum aggregate payout amount
 
$
37

$
32

$
32

Maximum aggregate payout amount
 
194

179

173
Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block]
The following table presents unrecognized compensation expense associated with the company's cash awards:
 
 
December 31
$ in millions
 
2015
2014
2013
Unrecognized compensation expense
 
$
128

$
122

$
108