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Employee benefit plans
 3 Months Ended
Mar. 31, 2020
Defined Benefit Plan [Abstract]  
Employee benefit plans Employee benefit plans

The components of net periodic benefit (credit) cost are presented below. The service cost component is reflected in staff expense, whereas the remaining components are reflected in other expense.

Net periodic benefit (credit) cost
Quarter ended
March 31, 2020
 
March 31, 2019
(in millions)
Domestic pension benefits

Foreign pension benefits

Health care benefits

 
Domestic pension benefits

Foreign pension benefits

Health care benefits

Service cost
$
—

$
3

$
—

 
$
—

$
3

$
—

Interest cost
39

7

1

 
44

8

2

Expected return on assets
(80
)
(10
)
(1
)
 
(84
)
(11
)
(2
)
Other
22

3

(1
)
 
13

—

(1
)
Net periodic benefit (credit) cost
$
(19
)
$
3

$
(1
)
 
$
(27
)
$
—

$
(1
)