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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule Of Multiemployer Plans Table [Text Block]
(dollars in millions)  Pension
Protection Act
Zone Status		FIP/
RP Status		Contributions    
Pension FundEIN/Pension
Plan Number		20192018Pending/
Implemented		201920182017Surcharge
Imposed		Expiration Date of
Collective-Bargaining
Agreement
National Elevator Industry Pension Plan23-2694291GreenGreenNo$127  $120  $114  NoJuly 8, 2022
Other funds32  31  31  
$159  $151  $145  
Share-based Payment Arrangement, Cost 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, net of expected forfeitures, as follows:
(dollars in millions)2019  2018  2017  
Total compensation cost recognized$356  $251  $192  
Schedule of Stock Options Roll Forward [Table Text Block]
A summary of the transactions under all long-term incentive plans for the year ended December 31, 2019 follows:
 Stock OptionsStock Appreciation RightsPerformance Share UnitsOther
Incentive
Shares/Units
(shares and units in thousands)SharesAverage
Price*		SharesAverage
Price*		UnitsAverage
Price*
Outstanding at:
December 31, 20181,603  $99.89  32,066  $99.95  1,806  $110.41  3,047  
Granted339  124.72  8,081  123.54  839  121.22  1,223  
Ancillary**—  —  —  —  101  95.28  —  
Exercised / earned(317) 88.61  (6,843) 84.44  (758) 95.28  (816) 
Cancelled(57) 121.69  (591) 122.76  (69) 118.21  (135) 
December 31, 20191,568  $106.75  32,713  $108.61  1,919  $120.04  3,319  
* weighted-average grant / exercise price
** ancillary shares earned based on actual performance achieved on the 2016 award
Disclosure Of Share Based Compensation Arrangements By Share Based Payment Award Text Block
The following table summarizes information about equity awards outstanding that are vested and expected to vest as well as equity awards outstanding that are exercisable at December 31, 2019:
 Equity Awards Vested and Expected to VestEquity Awards That Are Exercisable
(shares in thousands; aggregate intrinsic value in millions)AwardsAverage
Price*		Aggregate
Intrinsic
Value		Remaining
Term**		AwardsAverage
Price*		Aggregate
Intrinsic
Value		Remaining
Term**
Stock Options/Stock Appreciation Rights33,769  $107.58  $1,424  5.9 years19,285  $96.56  $1,026  4.0 years
Performance Share Units/Restricted Stock5,514  —  826  2.1 years
* weighted-average exercise price per share
** weighted-average contractual remaining term in years
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] The following table indicates the assumptions used in estimating fair value for the years ended December 31, 2019, 2018 and 2017. Lattice-based option models incorporate ranges of assumptions for inputs; those ranges are as follows:
201920182017
Expected volatility
18.8% - 19.7%
17.5% - 21.1%
19 %
Weighted-average volatility20 %18 %19 %
Expected term (in years)
6.5 - 6.6
6.5 - 6.6
6.5
Expected dividend yield2.4 %2.2 %2.4 %
Risk-free rate
2.3% - 2.7%
1.3% - 2.7%
0.5% - 2.5%
Pension Plan [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Defined Benefit Plans Disclosures [Text Block]
(dollars in millions)20192018
Change in Benefit Obligation:
Beginning balance$37,795  $36,999  
Service cost359  372  
Interest cost1,340  1,117  
Actuarial loss (gain)4,651  (2,048) 
Total benefits paid(2,174) (1,932) 
Net settlement, curtailment and special termination benefits(267) (38) 
Plan amendments6  65  
Business combinations(6) 3,694  
Other127  (434) 
Ending balance$41,831  $37,795  
Change in Plan Assets:
Beginning balance$35,253  $35,689  
Actual return on plan assets6,311  (1,667) 
Employer contributions207  238  
Benefits paid(2,174) (1,932) 
Settlements(54) (38) 
Business combinations(10) 3,355  
Other156  (392) 
Ending balance$39,689  $35,253  
Funded Status:
Fair value of plan assets$39,689  $35,253  
Benefit obligations(41,831) (37,795) 
Funded status of plan$(2,142) $(2,542) 
Amounts Recognized in the Consolidated Balance Sheet Consist of:
Noncurrent assets$617  $686  
Current liability(88) (88) 
Noncurrent liability(2,671) (3,140) 
Net amount recognized$(2,142) $(2,542) 
Amounts Recognized in Accumulated Other Comprehensive Loss Consist of:
Net actuarial loss$8,910  $8,606  
Prior service cost 203  139  
Net amount recognized$9,113  $8,745  
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Table Text Block]
Information for pension plans with accumulated benefit obligations in excess of plan assets: 
(dollars in millions)20192018
Projected benefit obligation$39,267  $25,884  
Accumulated benefit obligation38,816  25,455  
Fair value of plan assets36,530  22,803  
Defined Benefit Plan, Plan with Projected Benefit Obligation in Excess of Plan Assets [Table Text Block]
Information for pension plans with projected benefit obligations in excess of plan assets: 
(dollars in millions)20192018
Projected benefit obligation$39,680  $28,591  
Accumulated benefit obligation39,178  27,968  
Fair value of plan assets36,921  25,362  
Schedule of Net Benefit Costs [Table Text Block]
The components of the net periodic pension benefit are as follows: 
(dollars in millions)201920182017
Pension Benefits:
Service cost$359  $372  $374  
Interest cost1,340  1,117  1,120  
Expected return on plan assets(2,430) (2,255) (2,215) 
Amortization of prior service cost (credit)17  (41) (36) 
Recognized actuarial net loss265  401  575  
Net settlement, curtailment and special termination benefits (gain) loss(54) 1  3  
Net periodic pension benefit - employer$(503) $(405) $(179) 
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
Other changes in plan assets and benefit obligations recognized in other comprehensive loss in 2019 are as follows: 
(dollars in millions)  
Current year actuarial loss$553  
Amortization of actuarial loss(265) 
Current year prior service cost6  
Amortization of prior service cost(17) 
Net settlement and curtailment 57  
Other34  
Total recognized in other comprehensive loss$368  
Net recognized in net periodic pension benefit and other comprehensive loss$(135) 
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]
The estimated amount that will be amortized from accumulated other comprehensive loss into net periodic pension (benefit) cost in 2020 is as follows:
(dollars in millions)  
Net actuarial loss$371  
Prior service cost51  
$422  
Defined Benefit Plan, Assumptions [Table Text Block]
Major assumptions used in determining the benefit obligation and net cost for pension plans are presented in the following table as weighted-averages: 
Benefit ObligationNet Cost
  20192018201920182017
Discount rate
PBO3.0 %4.0 %3.9 %3.4 %3.8 %
Interest cost1
—  —  3.6 %3.0 %3.3 %
Service cost1
—  —  3.6 %3.3 %3.6 %
Salary scale4.2 %4.2 %4.2 %4.2 %4.1 %
Expected return on plan assets—  —  6.7 %6.8 %7.3 %
Note 1 The discount rates used to measure the service cost and interest cost applies to our significant plans. The PBO discount rate is used for the service cost and interest cost measurements for non-significant plans.
Schedule of Allocation of Plan Assets [Table Text Block]
The fair values of pension plan assets at December 31, 2019 and 2018 by asset category are as follows:
(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 LevelingTotal
Asset Category:
Public Equities
Global Equities$3,588  $5  $—  $—  $3,593  
Global Equity Commingled Funds1
—  1,734  —  —  1,734  
Enhanced Global Equities 2
322  393  —  —  715  
Global Equity Funds at net asset value8
—  —  —  6,318  6,318  
Private Equities 3,8
—  —  202  1,230  1,432  
Fixed Income Securities
Governments969  116  —  —  1,085  
Corporate Bonds1  13,059  5  —  13,065  
Structured Products
—  17  —  —  17  
Fixed Income Securities8
—  —  —  6,262  6,262  
Real Estate 4,8
—  13  1,464  372  1,849  
Other 5,8
—  343  —  2,834  3,177  
Cash & Cash Equivalents 6,8
—  47  —  76  123  
Subtotal$4,880  $15,727  $1,671  $17,092  39,370  
Other Assets & Liabilities7
   319  
Total at December 31, 2019$39,689  
Public Equities
Global Equities$2,917  $4  $—  $—  $2,921  
Global Equity Commingled Funds1
185  426  —  —  611  
Enhanced Global Equities 2
79  605  —  —  684  
Global Equity Funds at net asset value 8
—  —  —  7,386  7,386  
Private Equities 3,8
—  —  133  1,194  1,327  
Fixed Income Securities
Governments1,789  162  —  —  1,951  
Corporate Bonds—  11,527  18  29  11,574  
Fixed Income Securities8
—  —  —  3,599  3,599  
Real Estate 4,8
—  13  1,387  429  1,829  
Other 5,8
—  262  —  2,368  2,630  
Cash & Cash Equivalents 6,8
—  220  —  138  358  
Subtotal$4,970  $13,219  $1,538  $15,143  34,870  
Other Assets & Liabilities7
   383  
Total at December 31, 2018$35,253  
Note 1 Represents commingled funds that invest primarily in common stocks.
Note 2 Represents enhanced equity separate account and commingled fund portfolios. A portion of the portfolio may include long-short market neutral and relative value strategies that invest in publicly traded, equity and fixed income securities, as well as derivatives of equity and fixed income securities and foreign currency.
Note 3 Represents limited partner investments with general partners that primarily invest in debt and equity.
Note 4 Represents investments in real estate including commingled funds and directly held properties.
Note 5 Represents insurance contracts and global balanced risk commingled funds consisting mainly of equity, bonds and some commodities.
Note 6 Represents short-term commercial paper, bonds and other cash or cash-like instruments.
Note 7  Represents trust receivables and payables that are not leveled.
Note 8  In accordance with ASU 2015-07, Fair Value Measurement (Topic 820), certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented for the total pension benefits plan assets.
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]
The fair value measurement of plan assets using significant unobservable inputs (Level 3) changed due to the following:
(dollars in millions)Private
Equities		Corporate
Bonds		Real
Estate		Total
Balance, December 31, 2017$46  $—  $1,446  $1,492  
Plan assets acquired—  33  —  33  
Realized (losses) gains—  (1) 10  9  
Unrealized gains relating to instruments still held in the reporting period—  2  38  40  
Purchases, sales, and settlements, net87  (16) (107) (36) 
Balance, December 31, 2018133  18  1,387  1,538  
Realized losses—  —  (2) (2) 
Unrealized gains relating to instruments still held in the reporting period32  —  27  59  
Purchases, sales, and settlements, net37  (13) 52  76  
Balance, December 31, 2019$202  $5  $1,464  $1,671  
Other Postretirement Benefits Plan [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Defined Benefit Plans Disclosures [Text Block]
(dollars in millions)20192018
Change in Benefit Obligation:
Beginning balance$810  $767  
Service cost2  2  
Interest cost31  26  
Actuarial gain(11) (52) 
Total benefits paid(69) (70) 
Business combinations—  186  
Plan amendments—  (43) 
Other2  (6) 
Ending balance$765  $810  
Change in Plan Assets:
Beginning balance$20  $—  
Employer contributions69  69  
Benefits paid(69) (70) 
Business combinations—  20  
Other—  1  
Ending balance$20  $20  
Funded Status:
Fair value of plan assets$20  $20  
Benefit obligations(765) (810) 
Funded status of plan$(745) $(790) 
Amounts Recognized in the Consolidated Balance Sheet Consist of:
Current liability$(47) $(61) 
Noncurrent liability(698) (729) 
Net amount recognized$(745) $(790) 
Amounts Recognized in Accumulated Other Comprehensive Loss Consist of:
Net actuarial gain$(181) $(184) 
Prior service credit(4) (47) 
Net amount recognized$(185) $(231) 
Schedule of Net Benefit Costs [Table Text Block]
The components of net periodic benefit cost are as follows:
(dollars in millions)201920182017
Other Postretirement Benefits:
Service cost$2  $2  $2  
Interest cost31  26  29  
Expected return on plan assets(1) —  —  
Amortization of prior service credit(42) (6) (1) 
Recognized actuarial net gain(12) (10) (9) 
Net periodic other postretirement (benefit) cost$(22) $12  $21  
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
Other changes in plan assets and benefit obligations recognized in other comprehensive loss in 2019 are as follows:
(dollars in millions)  
Current year actuarial gain$(10) 
Amortization of prior service credit42  
Amortization of actuarial net gain12  
Other2  
Total recognized in other comprehensive loss$46  
Net recognized in net periodic other postretirement benefit cost and other comprehensive loss$24  
Defined Benefit Plan, Assumptions [Table Text Block]
Major assumptions used in determining the benefit obligation and net cost for postretirement plans are presented in the following table as weighted-averages: 
 Benefit ObligationNet Cost
  20192018201920182017
Discount rate3.0 %4.1 %4.0 %3.4 %3.8 %
Expected return on assets—  —  7.0 %7.0 %N/A  
Schedule of Health Care Cost Trend Rates [Table Text Block]
Assumed health care cost trend rates are as follows: 
20192018
Health care cost trend rate assumed for next year6.5 %7.0 %
Rate that the cost trend rate gradually declines to5.0 %5.0 %
Year that the rate reaches the rate it is assumed to remain at20262026
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block] A one-percentage-point change in assumed health care cost trend rates would have the following effects:
 2019 One-Percentage-Point
(dollars in millions)IncreaseDecrease
Effect on total service and interest cost$1  $(1) 
Effect on postretirement benefit obligation25  (22)