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Fair Value Measurements and Guarantees Recurring Measurements and Additional (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Measured on a recurring basis    
Derivative Asset, Fair Value, Gross Asset $ 785 $ 3
Derivative Liability, Fair Value, Gross Liability (1,189) (6)
Additional disclosures:    
Collateral Already Posted, Aggregate Fair Value 296  
Carrying Amount [Member]    
Additional disclosures:    
Long-term debt, including current portion (23,675) (22,344)
Guarantees (39) (40)
Fair Value [Member]    
Additional disclosures:    
Long-term debt, including current portion (27,768) (27,043)
Guarantees (26) (27)
Level 1 [Member]    
Additional disclosures:    
Long-term debt, including current portion 0 0
Guarantees 0 0
Level 2 [Member]    
Additional disclosures:    
Long-term debt, including current portion (27,768) (27,043)
Guarantees (10) (11)
Level 3 [Member]    
Additional disclosures:    
Long-term debt, including current portion 0 0
Guarantees (16) (16)
Fair Value, Recurring [Member] | Carrying Amount [Member]    
Measured on a recurring basis    
ARO Trust investments 260 235
Derivative Asset, Fair Value, Gross Asset 84 [1] 3
Derivative Liability, Fair Value, Gross Liability (488) [1] (6)
Fair Value, Recurring [Member] | Fair Value [Member]    
Measured on a recurring basis    
ARO Trust investments 260 235
Derivative Asset, Fair Value, Gross Asset 84 [1] 3
Derivative Liability, Fair Value, Gross Liability (488) [1] (6)
Fair Value, Recurring [Member] | Level 1 [Member]    
Measured on a recurring basis    
ARO Trust investments 260 235
Derivative Asset, Fair Value, Gross Asset 2 [1] 1
Derivative Liability, Fair Value, Gross Liability (69) [1] (3)
Fair Value, Recurring [Member] | Level 2 [Member]    
Measured on a recurring basis    
ARO Trust investments 0 0
Derivative Asset, Fair Value, Gross Asset 81 [1] 2
Derivative Liability, Fair Value, Gross Liability (403) [1] (1)
Fair Value, Recurring [Member] | Level 3 [Member]    
Measured on a recurring basis    
ARO Trust investments 0 0
Derivative Asset, Fair Value, Gross Asset 1 [1] 0
Derivative Liability, Fair Value, Gross Liability (16) [1] $ (2)
Wiltel Guarantee [Member]    
Additional disclosures:    
Guarantor Obligations, Maximum Exposure, Undiscounted 25  
Indemnification Agreement [Member] | Carrying Amount [Member]    
Additional disclosures:    
Guarantees $ 0  
[1] Excludes approximately $296 million of net cash collateral in Level 1.