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Pension Plans and Other Post Employment Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
 
Defined Benefit Pension Plans
Other Post Employment Benefits
 
Successor
Predecessor
Successor
Predecessor
(In millions)
Three Months Ended March 31, 2018
Three Months Ended March 31, 2017
Three Months Ended March 31, 2018
Three Months Ended March 31, 2017
Service cost
$
34

$
33

$
2

$
2

Interest cost
190

195

21

22

Expected return on plan assets
(303
)
(308
)
—

—

Amortization of unrecognized loss
—

190

—

23

Amortization of prior service benefit
—

(1
)
—

(17
)
Net periodic benefit (credit) cost - Total
$
(79
)
$
109

$
23

$
30

Less: Discontinued operations
—

1

—

—

Net periodic benefit (credit) cost - Continuing operations
$
(79
)
$
108

$
23

$
30