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Pension Plans and Other Post Employment Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
 
Successor
Predecessor
Successor
Predecessor
(In millions)
Three Months Ended June 30, 2018
Three Months Ended June 30, 2017
Six Months Ended June 30, 2018
Six Months Ended June 30, 2017
Defined Benefit Pension Plans:
 
 
 
 
Service cost
$
33

$
34

$
67

$
67

Interest cost
189

197

379

392

Expected return on plan assets
(301
)
(309
)
(604
)
(617
)
Amortization of unrecognized (gain) loss
(1
)
189

(1
)
379

Amortization of prior service benefit
—

(1
)
—

(2
)
Curtailment/settlement gain1
(4
)
—

(4
)
—

Net periodic benefit (credit) cost - Total
$
(84
)
$
110

$
(163
)
$
219

Less: Discontinued operations
—

1

—

2

Net periodic benefit (credit) cost - Continuing operations
$
(84
)
$
109

$
(163
)
$
217

Other Post Employment Benefits:
 
 
 
 
Service cost
$
2

$
2

$
4

$
4

Interest cost
22

23

43

45

Amortization of unrecognized loss
—

23

—

46

Amortization of prior service benefit
—

(18
)
—

(35
)
Net periodic benefit cost - Continuing operations
$
24

$
30

$
47

$
60

1. 
The 2018 impact relates to the curtailment and settlement of pension plans in the U.S. and Australia.