Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Fair Value Measurements (Details)

v3.22.0.1
Employee Benefit Plans - Fair Value Measurements (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets $ 26,096 $ 26,139    
Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 13,521 12,865    
Level 2        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 11,932 12,576    
Level 3        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 643 698 $ 644 $ 602
Fair Value Measured at Net Asset Value Per Share        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 1,700 1,600    
Money market and interest-bearing cash        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 1,339 1,380    
Money market and interest-bearing cash | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 1,339 1,380    
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 5,888 5,835    
U.S. government and agency securities | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 4,948 4,590    
U.S. government and agency securities | Level 2        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 934 1,238    
U.S. government and agency securities | Level 3        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 6 7 8 9
Corporate debt        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 4,900 5,021    
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 4,900 5,021    
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 2,090 2,143    
Non-U.S. debt securities | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 925 1,021    
Non-U.S. debt securities | Level 2        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 1,165 1,122    
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 1,485 1,967    
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 1,485 1,967    
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 1,395 1,362    
Mutual and exchange traded funds | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 1,395 1,362    
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 3,419 3,199    
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 3,419 3,199    
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 4,826 4,438    
Common and preferred stocks | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 4,826 4,438    
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 87 73    
Real estate investment trusts | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 87 73    
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 7 7    
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 7 7 8 12
Other investments        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 660 714    
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 29 29    
Other investments | Level 3        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 630 684 $ 628 $ 576
Insurance Annuity Contracts        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 612 664    
Other Various Investments        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets $ 48 $ 50