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Pension and Other Post Employment Benefit (Tables)
 9 Months Ended
Sep. 30, 2017
Pension Plan  
Defined Benefit Plan Disclosure [Line Items]  
Schedules of Net Periodic Benefit Cost
 
Successor
Predecessor
(In millions)
For the Period
September 1 - September 30, 2017
For the Period
July 1 - August 31, 2017
Three Months Ended
September 30, 2016
For the Period
Jan. 1 - August 31, 2017
Nine Months Ended
September 30, 2016
Service cost
$
12

$
25

$
44

$
92

$
133

Interest cost
62

132

189

524

612

Expected return on plan assets
(102
)
(207
)
(327
)
(824
)
(996
)
Amortization of loss
—

127

229

506

605

Amortization of prior service benefit
—

(1
)
(2
)
(3
)
(5
)
Curtailment (gain) loss
—

—

(1
)
—

65

Settlement loss
—

—

22

—

60

Net periodic benefit (credit) cost - Total
$
(28
)
$
76

$
154

$
295

$
474

Less: Discontinued operations
—

1

1

3

—

Net periodic benefit (credit) cost - Continuing operations
$
(28
)
$
75

$
153

$
292

$
474
Other Post Employment Benefit Plans  
Defined Benefit Plan Disclosure [Line Items]  
Schedules of Net Periodic Benefit Cost
 
Successor
Predecessor
(In millions)
For the Period
September 1 - September 30, 2017
For the Period
July 1 - August 31, 2017
Three Months Ended
September 30, 2016
For the Period
Jan. 1 - August 31, 2017
Nine Months Ended
September 30, 2016
Service cost
$
1

$
2

$
2

$
6

$
9

Interest cost
6

15

20

60

64

Amortization of loss
—

15

21

61

56

Amortization of prior service benefit
—

(11
)
(36
)
(46
)
(111
)
Curtailment gain
—

—

—

—

(33
)
Net periodic benefit cost (credit) - Continuing operations
$
7

$
21

$
7

$
81

$
(15
)