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Debt Outstanding (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Debt $ 23,337 $ 23,080
Less current portion of long-term debt (1,538) (903)
Long-term debt $ 21,799 $ 22,177
Current portion of long-term debt, Weighted Average Effective Interest Rate 3.50% 4.70%
Notes and debentures, due through 2097    
Debt Instrument [Line Items]    
Debt $ 22,719 $ 22,519
Total Debt, Weighted Average Effective Interest Rate 4.60% 4.60%
Equipment obligations, due through 2028    
Debt Instrument [Line Items]    
Debt $ 378 $ 402
Total Debt, Weighted Average Effective Interest Rate 3.60% 3.60%
Mortgage bonds, due through 2047    
Debt Instrument [Line Items]    
Debt $ 47 $ 47
Total Debt, Weighted Average Effective Interest Rate 3.10% 3.10%
Financing obligations, due through 2029    
Debt Instrument [Line Items]    
Debt $ 298 $ 203
Total Debt, Weighted Average Effective Interest Rate 4.60% 6.10%
Unamortized fair value adjustment under acquisition method accounting, discount, debt issuance costs, and other, net    
Debt Instrument [Line Items]    
Debt $ (105) $ (91)