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Stock Compensation Plans and Other Compensation Arrangements (Tables)
 12 Months Ended
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Award Rollforward Activity
Stock award activity for the years ended December 31, 2014, 2015 and 2016, 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, 2014
 
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
Granted
 
483

 
186

 
 
Vested
 
(872
)
 
97

 
 
Forfeited
 
(49
)
 
143

 
 
Outstanding at December 31, 2016
 
1,148

 
$
167

 
1.3
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
 
2016
2015
2014
Minimum aggregate payout amount
 
$
39

$
37

$
32

Maximum aggregate payout amount
 
199

194

179