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Employee Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
PRB plans $ 8 $ 4 $ 12 $ 9  
Defined contribution plans 317 251 689 562  
Liability, Defined Benefit Plan, Current 307   307   $ 307
Liability, Defined Benefit Pension Plan, Noncurrent 4,579   4,579   4,807
Non-service pension income (447) (474) (891) (954)  
Total net periodic benefit (income) expense     (778) (714)  
Marketable securities held in trusts 719   719   774
UNITED STATES          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Defined benefit plans 0 0 0 0  
Foreign Plan          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Defined benefit plans 20 18 28 30  
Pension Plan [Member]          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Assets for Plan Benefits, Defined Benefit Plan 3,770   3,770   3,301
Liability, Defined Benefit Pension Plan, Noncurrent 3,914   3,914   4,133
Service cost 56 118 111 236  
Interest cost 627 380 1,253 762  
Expected return on plan assets (938) (888) (1,875) (1,778)  
Amortization of prior service credit (40) (41) (79) (83)  
Recognized actuarial net loss (gain) (95) 77 (190) 154  
Net settlement, curtailment and special termination benefit (gain) loss 0 0 2 (6)  
Non-service pension income (446) (472) (889) (951)  
Total net periodic benefit (income) expense (390) (354) (778) (715)  
Other Postretirement Benefits Plan [Member]          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Liability, Defined Benefit Pension Plan, Noncurrent 605   605   611
Service cost 1 2 2 4  
Interest cost 12 7 24 14  
Expected return on plan assets (5) (6) (10) (11)  
Amortization of prior service credit 0 0 0 0  
Recognized actuarial net loss (gain) (8) (3) (16) (6)  
Net settlement, curtailment and special termination benefit (gain) loss 0 0 0 0  
Non-service pension income (1) (2) (2) (3)  
Total net periodic benefit (income) expense 0 $ 0 0 $ 1  
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