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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2015
Employee Benefits and Share-based Compensation [Abstract]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]
We measure the cost of all share-based payments, including stock options, at fair value on the grant date and recognize this cost in the Consolidated Statement of Operations as follows:
(dollars in millions)
2015
 
2014
 
2013
Continuing operations
$
158

 
$
219

 
$
250

Discontinued operations
17

 
21

 
25

Total compensation cost recognized
$
175

 
$
240

 
$
275

 
Stock Options
 
Stock Appreciation Rights
 
Performance Share Units
 
Other
Incentive
Shares/Units

(shares and units in thousands)
Shares

 
Average
Price*

 
Shares

 
Average
Price*

 
Units

 
Average
Price**

 
Outstanding at:
 
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2014
2,288

 
$
73.76

 
38,404

 
$
77.48

 
2,532

 
$
87.65

 
1,495

Granted
312

 
110.78

 
5,411

 
111.15

 
693

 
115.08

 
574

Exercised/earned
(648
)
 
56.10

 
(4,975
)
 
64.56

 
(884
)
 
74.71

 
(487
)
Cancelled
(73
)
 
68.69

 
(729
)
 
96.67

 
(171
)
 
86.60

 
(115
)
December 31, 2015
1,879

 
$
86.19

 
38,111

 
$
83.58

 
2,170

 
$
101.78

 
1,467
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
(dollars in millions)
  
Current year actuarial loss
$
283

Amortization of actuarial loss
(882
)
Current year prior service cost
39

Amortization of prior service credit
11

Net settlement and curtailment loss
(145
)
Other
(180
)
Total recognized in other comprehensive loss
$
(874
)
Net recognized in net periodic pension cost and other comprehensive loss
$
(225
)
Schedule of Defined Benefit Plans Disclosures [Text Block]
(dollars in millions)
Quoted Prices in
Active Markets
For Identical Assets
(Level 1)

 
Significant
Observable 
Inputs
(Level 2)

 
Significant
Unobservable 
Inputs
(Level 3)

 
Not Subject to Leveling

 
Total

Asset Category:
 
 
 
 
 
 
 
 
 
Public Equities
 
 
 
 
 
 
 
 
 
Global Equities
$
5,884

 
$
—

 
$
—

 
$
—

 
$
5,884

Global Equity Commingled Funds1
—

 
779

 
—

 
—

 
779

Enhanced Global Equities 2
237

 
616

 
—

 
—

 
853

Global Equities Funds at net asset value8 
—

 
—

 
—

 
6,475

 
6,475

Private Equities 3,8
—

 
—

 
182

 
1,335

 
1,517

Fixed Income Securities

 

 

 

 
 
Governments
365

 
53

 
—

 
—

 
418

Corporate Bonds
—

 
7,013

 
—

 
—

 
7,013

Fixed Income Securities8
—

 
—

 
—

 
2,992

 
2,992

Real Estate 4,8
—

 
10

 
1,165

 
1,079

 
2,254

Other 5,8
—

 
334

 
—

 
1,706

 
2,040

Cash & Cash Equivalents 6,8
—

 
159

 
—

 
334

 
493

Subtotal
$
6,486

 
$
8,964

 
$
1,347

 
$
13,921

 
30,718

Other Assets & Liabilities7
 
 
 
 
 
 
 
 
293

Total at December 31, 2015
 
 
 
 
 
 
 
 
$
31,011

Public Equities
 
 
 
 
 
 
 
 
 
Global Equities
$
5,964

 
$
2

 
$
—

 
$
—

 
$
5,966

Global Equity Commingled Funds1
—

 
1,055

 
—

 
—

 
1,055

Enhanced Global Equities 2
292

 
1,192

 
—

 
—

 
1,484

Global Equities Funds at net asset value 8 
—

 
—

 
—

 
6,505

 
6,505

Private Equities 3,8
—

 
—

 
145

 
1,255

 
1,400

Fixed Income Securities

 

 

 


 
 
Governments
419

 
52

 
—

 
—

 
471

Corporate Bonds
4

 
7,132

 
—

 
—

 
7,136

Fixed Income Securities8
—

 
—

 
—

 
3,661

 
3,661

Real Estate 4,8
—

 
12

 
975

 
938

 
1,925

Other 5,8
—

 
349

 
—

 
1,896

 
2,245

Cash & Cash Equivalents 6,8
200

 
131

 
—

 
116

 
447

Subtotal
$
6,879

 
$
9,925

 
$
1,120

 
$
14,371

 
32,295

Other Assets & Liabilities7
 
 
 
 
 
 
 
 
443

Total at December 31, 2014
 
 
 
 
 
 
 
 
$
32,738

 
 
Benefit Obligation
 
Net Cost
  
 
2015
 
2014
 
2015
 
2014
 
2013
Discount rate
 
4.1
%
 
3.8
%
 
3.8
%
 
4.7
%
 
4.0
%
Salary scale
 
4.2
%
 
4.2
%
 
4.2
%
 
4.2
%
 
4.2
%
Expected return on plan assets
 
—

 
—

 
7.6
%
 
7.6
%
 
7.7
%
(dollars in millions)
2015
 
2014
Projected benefit obligation
$
30,915

 
$
34,261

Accumulated benefit obligation
30,362

 
33,495

Fair value of plan assets
25,827

 
28,478

(dollars in millions)
2015
 
2014
Change in Benefit Obligation:
 
 
 
Beginning balance
$
952

 
$
987

Service cost
3

 
3

Interest cost
34

 
41

Actuarial loss
—

 
7

Total benefits paid
(104
)
 
(107
)
Other
5

 
21

Ending balance
$
890

 
$
952

 
 
 
 
Change in Plan Assets:
 
 
 
Beginning balance
$
—

 
$
—

Employer contributions
84

 
85

Benefits paid from plan assets
(104
)
 
(107
)
Other
20

 
22

Ending balance
$
—

 
$
—

 
 
 
 
Funded Status:
 
 
 
Fair value of plan assets
$
—

 
$
—

Benefit obligations
(890
)
 
(952
)
Funded status of plan
$
(890
)
 
$
(952
)
 
 
 
 
Amounts Recognized in the Consolidated Balance Sheet Consist of:
 
 
 
Current liability
$
(84
)
 
$
(89
)
Noncurrent liability
(806
)
 
(863
)
Net amount recognized
$
(890
)
 
$
(952
)
 
 
 
 
Amounts Recognized in Accumulated Other Comprehensive Loss Consist of:
 
 
 
Net actuarial gain
$
(109
)
 
$
(113
)
Prior service (credit) cost
(1
)
 
1

Net amount recognized
$
(110
)
 
$
(112
)
(dollars in millions)
  
Net actuarial loss
$
540

Prior service credit
(32
)
 
$
508

(dollars in millions)
2015
 
2014
 
2013
Pension Benefits:
 
 
 
 
 
Service cost
$
493

 
$
487

 
$
569

Interest cost
1,399

 
1,517

 
1,373

Expected return on plan assets
(2,264
)
 
(2,215
)
 
(2,107
)
Amortization of prior service credit
(11
)
 
(8
)
 
(34
)
Recognized actuarial net loss
882

 
429

 
954

Net settlement and curtailment loss
150

 
13

 
1

Net periodic pension cost - employer
$
649

 
$
223

 
$
756

 
2015 One-Percentage-Point
(dollars in millions)
Increase

 
Decrease

Effect on total service and interest cost
$
2

 
$
(2
)
Effect on postretirement benefit obligation
57

 
(48
)
(dollars in millions)
2015
 
2014
 
2013
Other Postretirement Benefits:
 
 
 
 
 
Service cost
$
3

 
$
3

 
$
3

Interest cost
34

 
41

 
38

Amortization of prior service credit
—

 
(1
)
 
(10
)
Recognized actuarial net gain
(4
)
 
(4
)
 
(4
)
Net settlement and curtailment gain
(1
)
 
—

 
—

Net periodic other postretirement benefit cost
$
32

 
$
39

 
$
27

 
Benefit Obligation
 
Net Cost
  
2015
 
2014
 
2015
 
2014
 
2013
Discount rate
4.0
%
 
3.8
%
 
3.8
%
 
4.4
%
 
3.6
%
(dollars in millions)
  
Current year actuarial loss
$
1

Current year prior service credit
(2
)
Amortization of actuarial net gain
4

Other
(1
)
Total recognized in other comprehensive loss
$
2

Net recognized in net periodic other postretirement benefit cost and other comprehensive loss
$
34

 
2015
 
2014
Health care cost trend rate assumed for next year
6.5
%
 
7.0
%
Rate that the cost trend rate gradually declines to
5.0
%
 
5.0
%
Year that the rate reaches the rate it is assumed to remain at
2022

 
2019

(dollars in millions)
2015
 
2014
Change in Benefit Obligation:
 
 
 
Beginning balance
$
37,853

 
$
33,026

Service cost
493

 
487

Interest cost
1,399

 
1,517

Actuarial (gain) loss
(1,716
)
 
5,277

Total benefits paid
(1,796
)
 
(1,939
)
Net settlement and curtailment gain
(55
)
 
(1
)
Plan amendments
39

 
5

Other
(789
)
 
(519
)
Ending balance
$
35,428

 
$
37,853

 
 
 
 
Change in Plan Assets:
 
 
 
Beginning balance
$
32,738

 
$
31,355

Actual return on plan assets
265

 
3,140

Employer contributions
520

 
615

Benefits paid from plan assets
(1,796
)
 
(1,939
)
Settlements
(59
)
 
—

Other
(657
)
 
(433
)
Ending balance
$
31,011

 
$
32,738

 
 
 
 
Funded Status:
 
 
 
Fair value of plan assets
$
31,011

 
$
32,738

Benefit obligations
(35,428
)
 
(37,853
)
Funded status of plan
$
(4,417
)
 
$
(5,115
)
 
 
 
 
Amounts Recognized in the Consolidated Balance Sheet Consist of:
 
 
 
Noncurrent assets
$
742

 
$
681

Current liability
(71
)
 
(104
)
Noncurrent liability
(5,088
)
 
(5,692
)
Net amount recognized
$
(4,417
)
 
$
(5,115
)
 
 
 
 
Amounts Recognized in Accumulated Other Comprehensive Loss Consist of:
 
 
 
Net actuarial loss
$
8,224

 
$
9,068

Prior service credit
(57
)
 
(27
)
Net amount recognized
$
8,167

 
$
9,041

(dollars in millions)
Private
Equities

 
Real
Estate

 
Total

Balance, December 31, 2013
$
90

 
$
1,045

 
$
1,135

Unrealized gains relating to instruments still held in the reporting period
1

 
66

 
67

Purchases, sales, and settlements, net
54

 
(136
)
 
(82
)
Balance, December 31, 2014
145

 
975

 
1,120

Realized gains (losses)
3

 
(4
)
 
(1
)
Unrealized gains relating to instruments still held in the reporting period
42

 
105

 
147

Purchases, sales, and settlements, net
(8
)
 
89

 
81

Balance, December 31, 2015
$
182

 
$
1,165

 
$
1,347
Disclosure Of Share Based Compensation Arrangements By Share Based Payment Award Text Block
 
 
Equity Awards Vested and Expected to Vest
 
Equity Awards That Are Exercisable
(shares in thousands; aggregate intrinsic value in millions)
 
Awards

 
Average
Price*

 
Aggregate
Intrinsic
Value

 
Remaining
Term**
 
Awards

 
Average
Price*

 
Aggregate
Intrinsic
Value

 
Remaining
Term**
Stock Options/Stock Appreciation Rights
 
39,894

 
$
82.95

 
$
675

 
5.4 years
 
25,887

 
$
72.74

 
$
621

 
4.1 years
Performance Share Units/Restricted Stock
 
2,128

 
—

 
204

 
1.7 years
 
 
 
 
 
 
 
 
 
 
2015
 
2014
 
2013
Expected volatility
 
20% - 23%

 
22% - 26%

 
26% - 27%

Weighted-average volatility
 
21
%
 
26
%
 
27
%
Expected term (in years)
 
6.0 - 6.8

 
7.6 - 8.0

 
7.3 - 7.6

Expected dividends
 
2.2
%
 
2.2
%
 
2.6
%
Risk-free rate
 
0.0% - 2.2%

 
0.0% - 3.1%

 
0.1% - 1.9%
Schedule Of Multiemployer Plans Table [Text Block]
(dollars in millions)
 
  
 
Pension
Protection Act
Zone Status
 
FIP/
RP Status
 
Contributions
 
  
 
  
Pension Fund
 
EIN/Pension
Plan Number
 
2015
 
2014
 
Pending/
Implemented
 
2015

 
2014

 
2013

 
Surcharge
Imposed
 
Expiration Date of
Collective-Bargaining
Agreement
National Elevator Industry Pension Plan
 
23-2694291
 
Green
 
Green
 
No
 
$
88

 
$
79

 
$
71

 
No
 
July 8, 2017
Other funds
 
 
 
 
 
 
 
 
 
32

 
34

 
34

 
 
 
 
 
 
 
 
 
 
 
 
 
 
$
120

 
$
113

 
$
105