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Workforce Reduction Plan (Tables)
 12 Months Ended
Dec. 31, 2019
Restructuring and Related Activities [Abstract]  
Workforce Reduction Plan [Table Text Block]

Millions

for the Years Ended December 31,

2019

2018

2017

Compensation and benefits expense

Severance

$

22 

$

23 

$

12 

Equity compensation

2 

2 

5 

Other income

Pension

-

-

69 

Total expense

$

24 

$

25 

$

86