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Postretirement Benefits (Tables)
 12 Months Ended
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]  
Components Of Postretirement Benefit Expense [Table Text Block]
Net periodic pension expense for qualified and nonqualified U.S. and non-U.S. defined benefit plans comprised the following: 
  
2017
2016
2015
In millions
U.S.
Plans
Non-
U.S.
Plans
U.S.
Plans
Non-
U.S.
Plans
U.S.
Plans
Non-
U.S.
Plans
Service cost
$
160

$
4

$
158

$
4

$
161

$
6

Interest cost
536

9

580

9

597

10

Expected return on plan assets
(774
)
(11
)
(815
)
(10
)
(783
)
(11
)
Actuarial loss / (gain)
339

2

400

1

428

1

Amortization of prior service cost
28

—

41

—

43

—

Curtailment loss / (gain) (a)
23

—

—

—

—

—

Settlement loss
383

1

445

—

15

—

Special termination benefits (a)
22

—

—

—

—

—

Net periodic pension expense
$
717

$
5

$
809

$
4

$
461

$
6



(a) Recorded in Discontinued operations in the consolidated statement of operations.
Other Postretirement Benefits Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Components Of Postretirement Benefit Expense [Table Text Block]
components of postretirement benefit expense in 2017, 2016 and 2015 were as follows: 
In millions
2017
2016
2015
 
U.S.
Plans
Non-
U.S.
Plans
U.S.
Plans
Non-
U.S.
Plans
U.S.
Plans
Non-
U.S.
Plans
Service cost
$
1

$
—

$
1

$
—

$
1

$
1

Interest cost
11

2

11

3

11

5

Actuarial loss
8

3

5

2

6

1

Amortization of prior service credits
(3
)
(4
)
(4
)
(4
)
(10
)
(2
)
Net postretirement (benefit) expense
$
17

$
1

$
13

$
1

$
8

$
5
Discount Rates Used To Determine Net Cost [Table Text Block]
The weighted average assumptions used to determine the benefit obligation at December 31, 2017 and 2016 were as follows: 
 
2017
2016
 
U.S.
Plans
Non-
U.S.
Plans
U.S.
Plans
Non-
U.S.
Plans
Discount rate
3.50
%
9.38
%
4.00
%
10.53
%
Health care cost trend rate assumed for next year
6.50
%
10.27
%
6.50
%
10.90
%
Rate that the cost trend rate gradually declines to
5.00
%
5.15
%
5.00
%
5.81
%
Year that the rate reaches the rate it is assumed to remain
2022

2028

2022

2027
Changes In Postretirement Benefit Obligation, Plan Assets, Funded Status And Amounts Recognized In Balance Sheet And Accumulated Other Comprehensive (Loss) Income [Table Text Block]
The plans are only funded in an amount equal to benefits paid. The following table presents the changes in benefit obligation and plan assets for 2017 and 2016: 
In millions
2017
2016
 
U.S.
Plans
Non-
U.S.
Plans
U.S.
Plans
Non-
U.S.
Plans
Change in projected benefit obligation:
 
 
 
 
Benefit obligation, January 1
$
280

$
23

$
275

$
45

Service cost
1

—

1

—

Interest cost
11

2

11

3

Participants’ contributions
5

—

5

—

Actuarial (gain) loss
14

2

31

5

Plan amendments
—

—

—

(35
)
Benefits paid
(42
)
(2
)
(44
)
(1
)
Less: Federal subsidy
1

—

1

—

Currency Impact
—

—

—

6

Benefit obligation, December 31
$
270

$
25

$
280

$
23

Change in plan assets:
 
 
 
 
Fair value of plan assets, January 1
$
—

$
—

$
—

$
—

Company contributions
37

2

39

1

Participants’ contributions
5

—

5

—

Benefits paid
(42
)
(2
)
(44
)
(1
)
Fair value of plan assets, December 31
$
—

$
—

$
—

$
—

Funded status, December 31
$
(270
)
$
(25
)
$
(280
)
$
(23
)
Amounts recognized in the consolidated balance sheet under ASC 715:
 
 
 
 
Current liability
$
(28
)
$
(1
)
$
(29
)
$
(2
)
Non-current liability
(242
)
(24
)
(251
)
(21
)
 
$
(270
)
$
(25
)
$
(280
)
$
(23
)
Amounts recognized in accumulated other comprehensive income under ASC 715 (pre-tax):
 
 
 
 
Net actuarial loss (gain)
$
74

$
19

$
68

$
21

Prior service credit
(6
)
(30
)
(8
)
(34
)
 
$
68

$
(11
)
$
60

$
(13
)
Postretirement Benefit Adjustments Recognized In Other Comprehensive (Loss) Income [Table Text Block]
The components of the $8 million and $2 million change in the amounts recognized in OCI during 2017 for U.S. and non-U.S. plans, respectively, consisted of: 
In millions
U.S.
Plans
Non-
U.S.
Plans
Current year actuarial loss
$
14

$
1

Amortization of actuarial (loss) gain
(8
)
(3
)
Current year prior service cost
—

—

Amortization of prior service credit
2

4

Currency impact
—

—

 
$
8

$
2
Estimated Total Future Postretirement Benefit Payments, Net Of Participant Contributions And Estimated Future Medicare Part D Subsidy Receipts [Table Text Block]
At December 31, 2017, estimated total future postretirement benefit payments, net of participant contributions and estimated future Medicare Part D subsidy receipts, were as follows: 
In millions
Benefit
Payments
Subsidy Receipts
Benefit
Payments
 
U.S.
Plans
U.S.
Plans
Non-
U.S.
Plans
2018
$
29

$
1

$
1

2019
27

1

1

2020
25

1

1

2021
24

1

—

2022
22

1

—

2023 – 2027
91

5

4
Net Cost [Member] | Other Postretirement Benefits Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Discount Rates Used To Determine Net Cost [Table Text Block]
The discount rates used to determine net U.S. and non-U.S. postretirement benefit cost for the years ended December 31, 2017, 2016 and 2015 were as follows: 
 
2017
2016
2015
 
U.S.
Plans
Non-
U.S.
Plans
U.S.
Plans
Non-
U.S.
Plans
U.S.
Plans
Non-
U.S.
Plans
Discount rate
4.00
%
10.53
%
4.20
%
12.23
%
3.90
%
11.52
%