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General and Summary of Significant Accounting Policies Effect of Change in Estimate (Tables)
 12 Months Ended
Dec. 31, 2015
Change in Accounting Estimate [Line Items]  
Schedule of Change in Accounting Estimate [Table Text Block]
The impact of the change in approach on expected service costs for the U.S. and U.K. plans in 2016 is shown below (in millions):
 
Expected 2016 Service Cost
 
Expected 2016 Interest Cost
 
Disaggregated rate approach
 
Aggregate rate approach
 
Impact of change
 
Disaggregated rate approach
 
Aggregate rate approach
 
Impact of change
U.S.
$
13

 
$
14

 
$
(1
)
 
$
42

 
$
51

 
$
(9
)
U.K.
3

 
4

 
(1
)
 
7

 
9

 
(2
)
Total
$
16

 
$
18

 
$
(2
)
 
$
49

 
$
60

 
$
(11
)