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Employee Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Defined benefit plan, benefit obligation, increase (decrease) due to remeasurement   $ 2,400      
Defined benefit plans     $ 25 $ 42  
PRB plans $ 4 0 4 0  
Defined contribution plans 238 227 509 440  
Liability, Defined Benefit Plan, Current 314   314   $ 314
Liability, Defined Benefit Pension Plan, Noncurrent 9,929   9,929   10,342
Non-service pension (income) expense (490) (237) (981) (405)  
Total net periodic benefit (income) expense     (715) (223)  
Marketable securities held in trusts         881
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 14 34 21 42  
Pension Plan [Member]          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Assets for Plan Benefits, Defined Benefit Plan 1,069   1,069   424
Liability, Defined Benefit Pension Plan, Noncurrent 8,805   8,805   9,131
Service cost 131 142 262 179  
Interest cost 313 452 625 705  
Expected return on plan assets (871) (814) (1,739) (1,335)  
Amortization of prior service cost (credit) (42) 13 (84) 26  
Recognized actuarial net loss (gain) 109 83 218 169  
Net settlement, curtailment and special termination benefit loss 3 27 3 27  
Non-service pension (income) expense (488) (239) (977) (408)  
Total net periodic benefit (income) expense (357) (97) (715) (229)  
Other Postretirement Benefits Plan [Member]          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Liability, Defined Benefit Pension Plan, Noncurrent 1,058   1,058   1,072
Service cost 2 2 4 3  
Interest cost 6 10 12 16  
Expected return on plan assets (5) (4) (10) (5)  
Amortization of prior service cost (credit) (1) (1) (2) (2)  
Recognized actuarial net loss (gain) (2) (3) (4) (6)  
Net settlement, curtailment and special termination benefit loss 0 0 0 0  
Non-service pension (income) expense (2) 2 (4) 3  
Total net periodic benefit (income) expense 0 $ 4 0 $ 6  
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 $ 66   $ 66   $ 139