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Postretirement benefits Schedule of Allocation of Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Other Investments $ 11,169 $ 7,945  
Cash 1,659 1,747 $ 1,537
Other Postretirement Benefits Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 119 120 152
Fair Value, Recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Other Investments 767 882  
Fair Value, Recurring [Member] | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Other Investments 286 434  
Fair Value, Recurring [Member] | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Other Investments 481 438  
Fair Value, Recurring [Member] | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Other Investments 0 10  
Other Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Other Investments 51 60  
Investment Funds Limited Partnerships Partially Owned Investment Companies Fair Value [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Other Investments 10,108 6,770  
UNITED STATES | Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 3,307 3,108  
Defined Benefit Plan, Plan Assets, Amount 4,151 3,739 3,301
Cash 127 14  
UNITED STATES | Pension Plan [Member] | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 2,287 2,127  
UNITED STATES | Pension Plan [Member] | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 1,019 981  
UNITED STATES | Pension Plan [Member] | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 1 0  
UNITED STATES | Pension Plan [Member] | Short-term investments      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 33 59  
UNITED STATES | Pension Plan [Member] | Short-term investments | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 33 59  
UNITED STATES | Pension Plan [Member] | Short-term investments | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 0 0  
UNITED STATES | Pension Plan [Member] | Short-term investments | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 0 0  
UNITED STATES | Pension Plan [Member] | US Treasury and Government [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 472 436  
UNITED STATES | Pension Plan [Member] | US Treasury and Government [Member] | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 380 250  
UNITED STATES | Pension Plan [Member] | US Treasury and Government [Member] | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 92 186  
UNITED STATES | Pension Plan [Member] | US Treasury and Government [Member] | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 0 0  
UNITED STATES | Pension Plan [Member] | Debt Security, Government, Non-US [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 923 793  
UNITED STATES | Pension Plan [Member] | Debt Security, Government, Non-US [Member] | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 0 0  
UNITED STATES | Pension Plan [Member] | Debt Security, Government, Non-US [Member] | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 923 793  
UNITED STATES | Pension Plan [Member] | Debt Security, Government, Non-US [Member] | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 0 0  
UNITED STATES | Pension Plan [Member] | States, municipalities, and political subdivisions      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 4 2  
UNITED STATES | Pension Plan [Member] | States, municipalities, and political subdivisions | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 0 0  
UNITED STATES | Pension Plan [Member] | States, municipalities, and political subdivisions | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 4 2  
UNITED STATES | Pension Plan [Member] | States, municipalities, and political subdivisions | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 0 0  
UNITED STATES | Pension Plan [Member] | Defined Benefit Plan, Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 1,872 1,818  
UNITED STATES | Pension Plan [Member] | Defined Benefit Plan, Equity Securities [Member] | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 1,871 1,818  
UNITED STATES | Pension Plan [Member] | Defined Benefit Plan, Equity Securities [Member] | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 0 0  
UNITED STATES | Pension Plan [Member] | Defined Benefit Plan, Equity Securities [Member] | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 1 0  
UNITED STATES | Pension Plan [Member] | Defined Benefit Plan, Derivative      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 3    
UNITED STATES | Pension Plan [Member] | Defined Benefit Plan, Derivative | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 3    
UNITED STATES | Pension Plan [Member] | Defined Benefit Plan, Derivative | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 0    
UNITED STATES | Pension Plan [Member] | Defined Benefit Plan, Derivative | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 0    
UNITED STATES | Other Investments [Member] | Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Other Investments 542 543  
UNITED STATES | Investment Funds Limited Partnerships Partially Owned Investment Companies Fair Value [Member] | Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Other Investments 175 74  
Non - U.S. | Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 1,128 1,129  
Defined Benefit Plan, Plan Assets, Amount 1,318 1,284 $ 1,141
Non - U.S. | Pension Plan [Member] | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 158 132  
Non - U.S. | Pension Plan [Member] | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 970 997  
Non - U.S. | Pension Plan [Member] | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 0 0  
Non - U.S. | Pension Plan [Member] | Short-term investments      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 5 5  
Non - U.S. | Pension Plan [Member] | Short-term investments | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 5 5  
Non - U.S. | Pension Plan [Member] | Short-term investments | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 0 0  
Non - U.S. | Pension Plan [Member] | Short-term investments | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 0 0  
Non - U.S. | Pension Plan [Member] | Debt Security, Government, Non-US [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 679 609  
Non - U.S. | Pension Plan [Member] | Debt Security, Government, Non-US [Member] | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 0 0  
Non - U.S. | Pension Plan [Member] | Debt Security, Government, Non-US [Member] | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 679 609  
Non - U.S. | Pension Plan [Member] | Debt Security, Government, Non-US [Member] | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 0 0  
Non - U.S. | Pension Plan [Member] | Defined Benefit Plan, Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 444 515  
Non - U.S. | Pension Plan [Member] | Defined Benefit Plan, Equity Securities [Member] | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 153 127  
Non - U.S. | Pension Plan [Member] | Defined Benefit Plan, Equity Securities [Member] | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 291 388  
Non - U.S. | Pension Plan [Member] | Defined Benefit Plan, Equity Securities [Member] | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets excluding measured using NAV 0 0  
Non - U.S. | Other Investments [Member] | Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Other Investments 175 147  
Non - U.S. | Investment Funds Limited Partnerships Partially Owned Investment Companies Fair Value [Member] | Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Other Investments $ 15 $ 8