v3.26.3
Debt - Schedule of Debt Outstanding (Details)
$ in Millions
9 Months Ended 12 Months Ended
Aug. 06, 2026
USD ($)
Sep. 30, 2026
USD ($)
$ / €
Dec. 31, 2025
USD ($)
$ / €
Debt Instrument [Line Items]      
Current portion of debt   $ 1,726 $ 1,226
Long-term debt   31,445 30,597
Total debt(d)   $ 33,171 $ 31,823
Exchange rate | $ / €   1.1330 1.1746
Debt fair value adjustments   $ (98) $ 180
$3.5 billion credit facility due August 20, 2027      
Debt Instrument [Line Items]      
Current portion of debt     0
$3.5 billion credit facility due May 21, 2031      
Debt Instrument [Line Items]      
Current portion of debt   0  
Maximum borrowing capacity   3,500  
Commercial paper notes(a)      
Debt Instrument [Line Items]      
Current portion of debt   0 $ 13
Weighted average interest rate     3.85%
Current portion of other debt      
Debt Instrument [Line Items]      
Current portion of debt   41 $ 27
Trust I preferred securities, 4.75%, due March 2028(c) | Capital Trust I      
Debt Instrument [Line Items]      
Current portion of debt   111 111
Long-term debt   $ 109 110
Interest rate   4.75%  
EPC Building, LLC, promissory note, 3.967%, due 2026 through 2035 | EPC Building LLC      
Debt Instrument [Line Items]      
Long-term debt   $ 251 268
Interest rate   3.967%  
Other      
Debt Instrument [Line Items]      
Long-term debt   $ 164 154
Senior notes      
Debt Instrument [Line Items]      
Long-term debt   30,921 30,065
Proceeds from Debt, Net of Issuance Costs $ 1,730    
Senior notes | 4.15%, due August 2026 | Colorado Interstate Gas Company      
Debt Instrument [Line Items]      
Current portion of debt   $ 0 375
Interest rate   4.15%  
Senior notes | 1.75%, due November 2026      
Debt Instrument [Line Items]      
Current portion of debt   $ 500 500
Interest rate   1.75%  
Senior notes | 7.50%, due November 2026 | EPNG      
Debt Instrument [Line Items]      
Current portion of debt   $ 200 200
Interest rate   7.50%  
Senior notes | 6.70%, due February 2027      
Debt Instrument [Line Items]      
Current portion of debt   $ 7 0
Interest rate   6.70%  
Senior notes | 2.25%, due March 2027(b)      
Debt Instrument [Line Items]      
Current portion of debt   $ 567 0
Interest rate   2.25%  
Change to debt as a result of changes in exchange rate   $ 24 44
Senior notes | 7.00%, due March 2027 | TGP      
Debt Instrument [Line Items]      
Current portion of debt   $ 300 $ 0
Interest rate   7.00%  
Senior notes | 5.55% due August 2036      
Debt Instrument [Line Items]      
Long-term debt $ 1,150    
Interest rate 5.55%    
Senior notes | 6.15% due August 2056      
Debt Instrument [Line Items]      
Long-term debt $ 600    
Interest rate 6.15%