Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Fair Value Measurements (Details)

v3.24.0.1
Employee Benefit Plans - Fair Value Measurements (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets $ 19,655 $ 19,123    
Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 10,298 10,194    
Level 2        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 8,920 8,508    
Level 3        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 437 421 $ 643 $ 698
Fair Value Measured at Net Asset Value Per Share        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 1,700 1,900    
Money market and interest-bearing cash        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 1,013 1,329    
Money market and interest-bearing cash | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 1,013 1,329    
Money market and interest-bearing cash | Level 2        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Money market and interest-bearing cash | Level 3        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
U.S. government and agency securities        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 4,425 4,022    
U.S. government and agency securities | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 3,692 3,313    
U.S. government and agency securities | Level 2        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 729 704    
U.S. government and agency securities | Level 3        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 4 5 6 7
Corporate debt        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 3,343 3,587    
Corporate debt | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Corporate debt | Level 2        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 3,343 3,587    
Corporate debt | Level 3        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Non-U.S. debt securities        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 1,554 1,260    
Non-U.S. debt securities | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 567 327    
Non-U.S. debt securities | Level 2        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 987 933    
Non-U.S. debt securities | Level 3        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Asset-backed securities        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 1,464 1,273    
Asset-backed securities | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Asset-backed securities | Level 2        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 1,464 1,273    
Asset-backed securities | Level 3        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Mutual and exchange-traded funds        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 953 1,247    
Mutual and exchange-traded funds | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 953 1,247    
Mutual and exchange-traded funds | Level 2        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Mutual and exchange-traded funds | Level 3        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Collective investment funds        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 2,350 1,988    
Collective investment funds | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Collective investment funds | Level 2        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 2,350 1,988    
Collective investment funds | Level 3        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Common and preferred stocks        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 4,027 3,901    
Common and preferred stocks | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 4,027 3,901    
Common and preferred stocks | Level 2        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Common and preferred stocks | Level 3        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Real estate investment trusts        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 45 76    
Real estate investment trusts | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 45 76    
Real estate investment trusts | Level 2        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Real estate investment trusts | Level 3        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Participant loans        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 6 6    
Participant loans | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Participant loans | Level 2        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0 0    
Participant loans | Level 3        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 6 6 7 7
Other investments        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 475 434    
Other investments | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 1 1    
Other investments | Level 2        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 47 23    
Other investments | Level 3        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 427 410 $ 630 $ 684
Insurance Annuity Contracts        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 404 390    
Other Various Investments        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets $ 71 $ 44