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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Pension and PRB Contributions
We made the following contributions to our pension and PRB plans’ trusts during the years ended December 31:
(dollars in millions)202120202019
U.S. qualified defined benefit plans$— $885 $25 
International defined benefit plans42 125 30 
PRB plans17 15 — 
Schedule of Defined Benefit Plans Disclosures [Text Block]
PensionPRB
(dollars in millions)2021202020212020
Change in Benefit Obligation:
Beginning balance$71,257 $38,027 $1,535 $765 
Service cost attributable to continuing operations523 483 7 6 
Service cost attributable to discontinued operations— 1 — — 
Interest cost1,249 1,650 24 37 
Actuarial loss (gain)(1,643)7,029 (73)114 
Total benefits paid(1)
(4,098)(3,623)(165)(144)
Net settlement, curtailment and special termination benefits(89)(4)(11)(8)
Plan amendments59 (2,088)— (7)
Business combinations and divestitures(2)
48 29,385 — 724 
Other (3)
(92)397 53 48 
Ending balance$67,214 $71,257 $1,370 $1,535 
Change in Plan Assets:
Beginning balance$62,318 $36,225 $381 $20 
Actual return on plan assets4,983 9,885 36 80 
Employer contributions(1)
289 1,201 95 102 
Total benefits paid(1)
(4,098)(3,623)(165)(144)
Settlements(85)(32)(11)(8)
Business combinations and divestitures(2)
— 18,310 — 286 
Other (3)
(84)352 53 45 
Ending balance$63,323 $62,318 $389 $381 
Funded Status:
Fair value of plan assets$63,323 $62,318 $389 $381 
Benefit obligations(67,214)(71,257)(1,370)(1,535)
Funded status of plan$(3,891)$(8,939)$(981)$(1,154)
Amounts Recognized in the Consolidated Balance Sheet Consist of:
Noncurrent assets$3,214 $424 $— $— 
Current liability(232)(232)(78)(82)
Noncurrent liability(6,873)(9,131)(903)(1,072)
Net amount recognized$(3,891)$(8,939)$(981)$(1,154)
Amounts Recognized in Accumulated Other Comprehensive Loss Consist of:
Net actuarial (gain) loss$4,402 $8,023 $(199)$(117)
Prior service credit(1,715)(1,947)(6)(9)
Net amount recognized$2,687 $6,076 $(205)$(126)
(1)    Includes benefit payments paid directly by the company.
(2)    Consists primarily of liabilities and assets acquired as a part of the Raytheon Merger in 2020.
(3)    The amount included in Other primarily reflects the impact of foreign exchange translation, primarily for plans in the U.K. and Canada, and participant contributions.
Schedule of Expected Benefit Payments
The table below reflects the total benefit payments expected to be paid from the plans or from corporate assets.
(dollars in millions)PensionPRB
2022$4,473 $116 
20233,842 109 
20243,821 104 
20253,796 98 
20263,748 92 
2027-203118,142 388 
Marketable Securities The fair value of marketable securities held in trusts as of December 31 was as follows:
(dollars in millions)20212020
Marketable securities held in trusts$965 $881 
Pension Plan [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
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)20212020
Projected benefit obligation$28,960 $37,215 
Accumulated benefit obligation28,494 36,150 
Fair value of plan assets22,002 27,854 
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)20212020
Projected benefit obligation$31,471 $37,217 
Accumulated benefit obligation30,745 36,151 
Fair value of plan assets24,366 27,855 
Schedule of Net Benefit Costs [Table Text Block]
The components of the net periodic pension (income) expense are as follows: 
(dollars in millions)202120202019
Operating expense
Service cost$523 $483 $261 
Non-operating expense
Interest cost1,249 1,650 1,245 
Expected return on plan assets(3,476)(2,995)(2,252)
Amortization of prior service cost (credit)(168)51 16 
Recognized actuarial net loss435 337 245 
Net settlement, curtailment and special termination benefits (gain) loss22 45 (59)
Non-service pension income(1,938)(912)(805)
Total net periodic pension benefit (income) expense$(1,415)$(429)$(544)
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
Other changes in pension plan assets and benefit obligations recognized in other comprehensive loss in 2021 and 2020 are as follows:
(dollars in millions)20212020
Actuarial (gain) loss arising during the period$(3,158)$155 
Amortization of actuarial loss(435)(337)
Current year prior service cost (credit)59 (2,088)
Amortization of prior service cost168 (51)
Net settlement and curtailment (17)(34)
Separation of Carrier and Otis— (763)
Other (1)
(6)81 
Total recognized in other comprehensive (income) loss(3,389)(3,037)
Net recognized in net periodic benefit (income) cost and other comprehensive (income) loss$(4,804)$(3,466)
(1)    The amount included in Other primarily reflects the impact of foreign exchange translation, primarily for plans in the U.K. and Canada.
Defined Benefit Plan, Assumptions [Table Text Block]
Major assumptions used in determining the pension benefit obligation and net periodic pension benefit (income) expense are presented in the following table as weighted-averages: 
Benefit ObligationNet Periodic Benefit (Income) Expense
20212020202120202019
Discount rate
PBO2.8 %2.5 %2.5 %3.2 %4.0 %
Interest cost (1)
N/AN/A1.8 %2.8 %3.7 %
Service cost (1)
N/AN/A2.8 %3.5 %3.7 %
Salary scale4.4 %4.3 %4.4 %4.3 %4.3 %
Expected return on plan assetsN/AN/A6.5 %6.5 %6.8 %
Interest crediting rate4.0 %3.8 %3.8 %3.8 %3.8 %
(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, 2021 and 2020 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 Leveling(8)
Total
Asset Category:
Public Equities
Global Equities$9,411 $6 $— $— $9,417 
Global Equity Commingled Funds (1)
3 929 — — 932 
Enhanced Global Equities (2)
46 163 — — 209 
Other Public Equities— — — 8,495 8,495 
Private Equities (3)
— — — 4,490 4,490 
Fixed Income Securities
Governments1,933 1,172 — — 3,105 
Corporate Bonds1 18,681 — — 18,682 
Structured Products
— 25 — — 25 
Other Fixed Income— — — 7,367 7,367 
Real Estate (4)
— — 1,885 1,743 3,628 
Other (5)
— 91 — 5,351 5,442 
Cash & Cash Equivalents (6)
— 111 — 220 331 
Subtotal$11,394 $21,178 $1,885 $27,666 $62,123 
Other Assets & Liabilities (7)
   1,200 
Total at December 31, 2021
$63,323 
Public Equities
Global Equities$8,437 $5 $— $— $8,442 
Global Equity Commingled Funds (1)
1 2,686 — — 2,687 
Enhanced Global Equities (2)
56 185 — — 241 
Other Public Equities— — — 9,008 9,008 
Private Equities (3)
— — — 3,646 3,646 
Fixed Income Securities
Governments1,740 1,480 — — 3,220 
Corporate Bonds3 18,489 2 305 18,799 
Structured Products
— 24 — — 24 
Other Fixed Income— — — 6,631 6,631 
Real Estate (4)
— — 1,647 1,737 3,384 
Other (5)
— 99 — 5,088 5,187 
Cash & Cash Equivalents (6)
9 97 — 154 260 
Subtotal$10,246 $23,065 $1,649 $26,569 $61,529 
Other Assets & Liabilities (7)
   789 
Total at December 31, 2020
$62,318 
(1)    Represents commingled funds that invest primarily in common stocks.
(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.
(3)    Represents limited partnership investments with general partners that primarily invest in equity and debt.
(4)    Represents investments in real estate including commingled funds and directly held properties.
(5)    Represents global balanced risk commingled funds that invest in multiple asset classes including equity, fixed income and some commodities. “Other” also includes insurance contracts.
(6)    Represents short-term commercial paper, bonds and other cash or cash-like instruments.
(7)    Represents receivables, payables and certain individually immaterial international plan assets that are not leveled.
(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 EquitiesCorporate BondsReal EstateTotal
Balance, December 31, 2019
$202 $5 $1,464 $1,671 
Realized gains— — 7 7 
Unrealized gains (losses) relating to instruments still held in the reporting period16 — (129)(113)
Purchases, sales, and settlements, net10 (3)77 84 
Transfers in/out, net(228)— 228 — 
Balance, December 31, 2020
— 2 1,647 1,649 
Realized gains — — 212 212 
Unrealized gains relating to instruments still held in the reporting period— — 50 50 
Purchases, sales, and settlements, net— — (24)(24)
Transfers in/out, net— (2)— (2)
Balance, December 31, 2021
$— $— $1,885 $1,885 
Other Postretirement Benefits Plan [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Net Benefit Costs [Table Text Block]
The components of the net periodic PRB (income) expense are as follows:
(dollars in millions)202120202019
Operating expense
Service cost$7 $6 $2 
Non-operating expense
Interest cost24 37 31 
Expected return on plan assets(21)(13)(1)
Amortization of prior service credit(3)(3)(42)
Recognized actuarial net gain(6)(12)(12)
Net settlement, curtailment and special termination benefits loss— 1 — 
Non-service pension (income) expense(6)10 (24)
Total net periodic PRB benefit (income) expense$1 $16 $(22)
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
Other changes in PRB assets and benefit obligations recognized in other comprehensive loss in 2021 and 2020 are as follows:
(dollars in millions)20212020
Actuarial (gain) loss arising during the period$(88)$47 
Amortization of actuarial gain6 12 
Current year prior service cost (credit)— (7)
Amortization of prior service credit3 3 
Net settlement and curtailment — (1)
Other— 5 
Total recognized in other comprehensive (income) loss(79)59 
Net recognized in net periodic benefit (income) cost and other comprehensive loss$(78)$75 
Defined Benefit Plan, Assumptions [Table Text Block]
Major assumptions used in determining the PRB benefit obligation and net periodic PRB (income) expense are presented in the following table as weighted-averages: 
 Benefit ObligationNet Periodic Benefit (Income) Expense
20212020202120202019
Discount rate2.8 %2.4 %2.4 %3.1 %4.0 %
Expected return on assetsN/AN/A5.7 %5.7 %7.0 %
Assumed health care cost trend rates used in determining the PRB benefit obligation and net periodic PRB (income) expense are as follows:
20212020
Health care cost trend rate assumed for next year4.7 %5.0 %
Ultimate health care cost trend rate4.2 %4.3 %
Year that the rate reaches the ultimate health care cost trend rate20262026