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Employee Retirement Plans (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined contribution plans [Abstract]      
Company contributions to all defined contribution plans expensed $ 749 $ 561 $ 1,200
Maximum age after retirement that employees may use accrued unused sick time to pay for medical and dental premiums 65 years    
Change in benefit obligation [Roll Forward]      
APBO at beginning of period $ 428 288  
Service cost 25 22 17
Interest cost 10 10 10
Benefits paid (24) (10)  
Actuarial (gain)/loss (109) 63  
Curtailment 0 53  
Special termination benefits 0 2  
APBO at end of period 330 428 288
Estimated future benefit payments time period [Abstract]      
2021 21    
2022 20    
2023 19    
2024 20    
2025 21    
Next five years thereafter 115    
Reconciliation of funded status to accrued postretirement benefit cost recognized on the balance sheet [Abstract]      
Funded status (330) (428)  
Unrecognized net actuarial (gain) loss (69) 40  
Unrecognized prior service cost 3 3  
Accumulated other comprehensive income (loss) 66 (43)  
Consolidated Balance Sheet liability (330) (428)  
Components of periodic postretirement benefit cost [Abstract]      
Service cost 25 22 17
Interest cost 10 10 10
Amortization of prior service cost 0 1 1
Amortization of net gain 0 0 (2)
Curtailment 0 53 0
Special termination benefits 0 2 0
Net periodic postretirement benefit cost $ 35 $ 88 $ 26
Actuarial assumptions used to account for postretirement benefit plans [Abstract]      
Weighted-average discount rate (as a percent) 2.90% 2.45% 3.30%
Assumed healthcare cost trend rate (as a percent) 6.25% 6.75% 7.13%
Assumed healthcare cost trend rates [Abstract]      
Assumed healthcare cost trend rate 6.25%    
Assumed healthcare cost decline trend rate 4.75%