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Employee Retirement Plans (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined contribution plans [Abstract]      
Company contributions to all defined contribution plans expensed $ 793 $ 749 $ 561
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 $ 330 428  
Service cost 19 25 22
Interest cost 9 10 10
Benefits paid (11) (24)  
Actuarial gain (106) (109)  
APBO at end of period 241 330 428
Reconciliation of funded status to accrued postretirement benefit cost recognized on the balance sheet [Abstract]      
Funded status (241) (330)  
Unrecognized net actuarial gain (173) (69)  
Unrecognized prior service cost 3 3  
Accumulated other comprehensive income 170 66  
Consolidated Balance Sheet liability (241) (330)  
Components of periodic postretirement benefit cost [Abstract]      
Service cost 19 25 22
Interest cost 9 10 10
Amortization of prior service cost 0 0 1
Amortization of net gain $ (2) $ 0 $ 0
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Curtailment Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Salaries, wages, and benefits Salaries, wages, and benefits Salaries, wages, and benefits
Curtailment $ 0 $ 0 $ 53
Special termination benefits 0 0 2
Net periodic postretirement benefit cost $ 26 $ 35 $ 88
Actuarial assumptions used to account for postretirement benefit plans [Abstract]      
Weighted-average discount rate (as a percent) 5.60% 2.90% 2.45%
Assumed healthcare cost trend rate (as a percent) 6.50% 6.25% 6.75%
Assumed healthcare cost trend rates [Abstract]      
Assumed healthcare cost trend rate 6.50%    
Assumed healthcare cost decline trend rate 4.75%