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Pensions and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Net Periodic Benefit Cost
The net periodic pension and other postretirement benefit costs for the three months ended March 31, 2019 and 2018 were as follows:
 
Pension
 
Other Postretirement Benefits
 
Three Months Ended
March 31
 
Three Months Ended
March 31
($ in millions)
2019
 
2018
 
2019
 
2018
Service cost

$6

 

$8

 

$2

 

$2

Interest cost
26

 
24

 
6

 
6

Expected return on plan assets
(35
)
 
(38
)
 
—

 
—

Amortization of actuarial losses
15

 
16

 
2

 
5

Amortization of prior service credit
—

 
—

 
(14
)
 
(15
)
Net periodic benefit cost

$12

 

$10

 

($4
)
 

($2
)
Defined Contribution Plan Disclosures
 
Three Months Ended
March 31
($ in millions)
2019
 
2018
U.S. defined benefit pension contributions

$—

 

$25

Non-U.S. defined benefit pension mandatory contributions

$3

 

$5