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Pension and Other Postretirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2017
Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
Components of net cost of defined benefit plans
The Company has defined benefit pension plans covering eligible employees in the United States and in certain of its international subsidiaries. The net periodic benefit cost (credit) of such plans consisted of the following components: 
  
Three Months Ended 
 March 31,
 
2017
 
2016
($ in millions)
U.S.
 
International
 
U.S.
 
International
Service cost
$
77

 
$
61

 
$
73

 
$
58

Interest cost
113

 
41

 
113

 
52

Expected return on plan assets
(218
)
 
(94
)
 
(210
)
 
(95
)
Amortization of unrecognized prior service credit
(13
)
 
(2
)
 
(14
)
 
(3
)
Net loss amortization
44

 
23

 
29

 
22

Termination benefits
5

 
1

 
4

 
—

Curtailments
3

 
—

 
—

 
1

 
$
11

 
$
30

 
$
(5
)
 
$
35
Other Postretirement Benefit Plans  
Defined Benefit Plan Disclosure [Line Items]  
Components of net cost of defined benefit plans
The Company provides medical benefits, principally to its eligible U.S. retirees and similar benefits to their dependents, through its other postretirement benefit plans. The net cost (credit) of such plans consisted of the following components: 
  
Three Months Ended 
 March 31,
($ in millions)
2017
 
2016
Service cost
$
14

 
$
13

Interest cost
20

 
21

Expected return on plan assets
(19
)
 
(35
)
Amortization of unrecognized prior service credit
(25
)
 
(26
)
Termination benefits
1

 
1

Curtailments
(3
)
 
(1
)
 
$
(12
)
 
$
(27
)