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Debt Outstanding (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Debt $ 23,080 $ 22,895
Less current portion of long-term debt (903) (731)
Long-term debt $ 22,177 $ 22,164
Current portion of long-term debt, Weighted Average Effective Interest Rate 4.70% 3.70%
Notes and debentures, due 2022 to 2097    
Debt Instrument [Line Items]    
Debt $ 22,519 $ 22,294
Total Debt, Weighted Average Effective Interest Rate 4.60% 4.60%
Equipment obligations, due 2022 to 2028    
Debt Instrument [Line Items]    
Debt $ 402 $ 424
Total Debt, Weighted Average Effective Interest Rate 3.60% 3.60%
Mortgage bonds, due 2045 to 2047    
Debt Instrument [Line Items]    
Debt $ 47 $ 47
Total Debt, Weighted Average Effective Interest Rate 3.10% 3.10%
Financing obligations, due 2022 to 2029    
Debt Instrument [Line Items]    
Debt $ 203 $ 196
Total Debt, Weighted Average Effective Interest Rate 6.10% 6.10%
Unamortized fair value adjustment under acquisition method accounting, discount, debt issuance costs, and other, net    
Debt Instrument [Line Items]    
Debt $ (91) $ (66)