v3.25.4
Retirement Benefits (Narrative) (Details)
shares in Millions, $ in Millions, £ in Billions
 3 Months Ended 12 Months Ended
Jan. 01, 2017
Sep. 30, 2025
USD ($)
Sep. 30, 2025
GBP (£)
Dec. 31, 2025
USD ($)
shares
Dec. 31, 2024
USD ($)
definedBenefitSection
Dec. 31, 2023
USD ($)
Defined Benefit Plan Disclosure [Line Items]            
Assumed health care cost trend rate for medicare eligibles and non-medicare eligibles       5.43%    
Future assumed health care cost trend rate       5.11%    
Automatic company contribution (as a percent) 4.00%          
401(k) Plan's assets invested in common stock       $ 580 $ 737  
Pension  Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Invested in insurance policy will reimburse fund for all future benefit payments   $ 2,500 £ 1.9      
United States            
Defined Benefit Plan Disclosure [Line Items]            
Assumed health care cost trend rate for medicare eligibles and non-medicare eligibles       8.60%    
Future assumed health care cost trend rate       4.00%    
Cap on employer share of health care trend (as a percent)       5.00%    
Cost of defined contribution plans       $ 208 188 $ 173
United States | Nonqualified Plan            
Defined Benefit Plan Disclosure [Line Items]            
Expected employer contributions, next fiscal year       34    
United States | Qualified Plan            
Defined Benefit Plan Disclosure [Line Items]            
Expected employer contributions, next fiscal year       33    
Employer contributions       2    
United States | Pension  Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Accumulated benefit obligation for plans with accumulated benefit obligations in excess of plan assets       4,600 4,600  
Aggregate fair value of plan assets for plans with accumulated benefit obligations in excess of plan assets       4,100 4,100  
Projected benefit obligation for plans with projected benefit obligations in excess of plan assets       4,600 4,600  
Fair value of plan assets for plans with projected benefit obligations in excess of plan assets       4,100 4,100  
Employer contributions       $ 38 34  
United States | Post-retirement Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Number of shares held in defined benefit plan (in shares) | shares       1    
Change in plan assets (as a percent)       4.50%    
Employer contributions       $ 5 5  
Non-U.S.            
Defined Benefit Plan Disclosure [Line Items]            
Accumulated benefit obligation for plans with accumulated benefit obligations in excess of plan assets       436 462  
Aggregate fair value of plan assets for plans with accumulated benefit obligations in excess of plan assets       222 248  
Projected benefit obligation for plans with projected benefit obligations in excess of plan assets       532 564  
Fair value of plan assets for plans with projected benefit obligations in excess of plan assets       275 312  
Expected employer contributions, next fiscal year       39    
Non-U.S. | Pension  Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Employer contributions       44 59  
Non-U.S. | Post-retirement Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Employer contributions       $ 3 $ 3  
United Kingdom            
Defined Benefit Plan Disclosure [Line Items]            
Period between legally-prescribed negotiations between the company and the plans' trustee       3 years    
Number of segregated benefit pension fund | definedBenefitSection         4  
Cost of defined contribution plans       $ 183 $ 170 $ 158
United Kingdom | United Kingdom Pension and Postretirement Benefit Plan, Defined Benefit | Geographic Concentration Risk            
Defined Benefit Plan Disclosure [Line Items]            
Concentration risk (as a percent)       78.00%    
Equities and Equity Alternatives | United States            
Defined Benefit Plan Disclosure [Line Items]            
Target asset allocation percentage       50.00%    
Actual asset allocation percentage       50.00%    
Equities and Equity Alternatives | United States | Minimum            
Defined Benefit Plan Disclosure [Line Items]            
Target asset allocation percentage       46.00%    
Equities and Equity Alternatives | United States | Maximum            
Defined Benefit Plan Disclosure [Line Items]            
Target asset allocation percentage       54.00%    
Equities and Equity Alternatives | United Kingdom            
Defined Benefit Plan Disclosure [Line Items]            
Target asset allocation percentage       7.00%    
Actual asset allocation percentage       8.00%    
Fixed Income | United States            
Defined Benefit Plan Disclosure [Line Items]            
Target asset allocation percentage       50.00%    
Actual asset allocation percentage       50.00%    
Fixed Income | United States | Minimum            
Defined Benefit Plan Disclosure [Line Items]            
Target asset allocation percentage       46.00%    
Fixed Income | United States | Maximum            
Defined Benefit Plan Disclosure [Line Items]            
Target asset allocation percentage       54.00%    
Fixed Income | United Kingdom            
Defined Benefit Plan Disclosure [Line Items]            
Target asset allocation percentage       93.00%    
Actual asset allocation percentage       92.00%