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Stock Compensation Plans and Other Compensation Arrangements (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Award Rollforward Activity
Stock award activity for the years ended December 31, 2016, 2017 and 2018, 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
Per Share
 
Weighted-
Average
Remaining
Contractual
Term (in years)
Outstanding at January 1, 2016
 
1,586

 
$
122

 
1.2
Granted
 
483

 
186

 
 
Vested
 
(872
)
 
97

 
 
Forfeited
 
(49
)
 
143

 
 
Outstanding at December 31, 2016
 
1,148

 
$
167

 
1.3
Granted
 
397

 
233

 
 
Vested
 
(521
)
 
152

 
 
Forfeited
 
(86
)
 
198

 
 
Outstanding at December 31, 2017
 
938

 
$
192

 
1.0
Granted
 
376

 
321

 
 
Vested
 
(455
)
 
181

 
 
Forfeited
 
(63
)
 
250

 
 
Outstanding at December 31, 2018
 
796

 
$
244

 
0.8
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
 
2018
2017
2016
Minimum aggregate payout amount
 
$
36

$
38

$
39

Maximum aggregate payout amount
 
205

201

199