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Employee Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
PRB plans $ 8 $ 8 $ 20 $ 18  
Defined contribution plans 296 230 985 792  
Liability, Defined Benefit Plan, Current 307   307   $ 307
Liability, Defined Benefit Pension Plan, Noncurrent 4,457   4,457   4,807
Non-service pension income (443) (468) (1,334) (1,422)  
Total net periodic benefit (income) expense     (1,164) (1,062)  
Marketable securities held in trusts 737   737   774
UNITED STATES          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Defined benefit plans 9 0 9 0  
Foreign Plan          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Defined benefit plans 13 18 42 48  
Pension Plan [Member]          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Assets for Plan Benefits, Defined Benefit Plan 3,996   3,996   3,301
Liability, Defined Benefit Pension Plan, Noncurrent 3,816   3,816   4,133
Service cost 56 118 167 354  
Interest cost 627 380 1,880 1,142  
Expected return on plan assets (940) (883) (2,815) (2,661)  
Amortization of prior service credit (39) (40) (118) (123)  
Recognized actuarial net (gain) loss (94) 76 (284) 230  
Net settlement, curtailment, and special termination benefit (gain) loss 4 0 6 (6)  
Non-service pension income (442) (467) (1,331) (1,418)  
Total net periodic benefit (income) expense (386) (349) (1,164) (1,064)  
Other Postretirement Benefits Plan [Member]          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Liability, Defined Benefit Pension Plan, Noncurrent 581   581   611
Service cost 1 2 3 6  
Interest cost 12 7 36 21  
Expected return on plan assets (5) (5) (15) (16)  
Amortization of prior service credit 0 0 0 0  
Recognized actuarial net (gain) loss (8) (3) (24) (9)  
Net settlement, curtailment, and special termination benefit (gain) loss 0 0 0 0  
Non-service pension income (1) (1) (3) (4)  
Total net periodic benefit (income) expense 0 $ 1 0 $ 2  
Other pension and PRB related items          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Liability, Defined Benefit Pension Plan, Noncurrent $ 60   $ 60   $ 63