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Retirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
 
 
Pension benefits
 
Other postretirement
employee benefits
(in millions)
 
2019
 
2018
 
Three Months Ended March 31,
 
US
 
Non-US
 
US
 
Non-US
 
2019
 
2018
Service cost
 
$
—

 
$
5

 
$
—

 
$
5

 
$
—

 
$
—

Interest cost
 
2

 
3

 
2

 
3

 
1

 
1

Expected return on plan assets
 
(3
)
 
(5
)
 
(3
)
 
(7
)
 
—

 
—

Amortization of unrecognized prior service credit
 
—

 
—

 
—

 
—

 
(1
)
 
(1
)
Amortization of unrecognized loss
 
1

 
2

 
1

 
2

 
—

 
—

Net periodic benefit cost (income)
 
$
—

 
$
5

 
$
—

 
$
3

 
$
—

 
$
—