v3.26.1
Debt - Schedule of Debt Outstanding (Details)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2026
USD ($)
$ / €
Dec. 31, 2025
USD ($)
$ / €
Debt Instrument [Line Items]    
Current portion of debt $ 2,186 $ 1,226
Long-term debt 29,719 30,597
Total debt(d) $ 31,905 $ 31,823
Exchange rate | $ / € 1.1553 1.1746
Debt fair value adjustments $ 151 $ 180
$3.5 billion credit facility due August 20, 2027    
Debt Instrument [Line Items]    
Current portion of debt 0 0
Maximum borrowing capacity 3,500  
Commercial paper notes(a)    
Debt Instrument [Line Items]    
Current portion of debt $ 88 $ 13
Weighted average interest rate 3.95% 3.85%
Current portion of other debt    
Debt Instrument [Line Items]    
Current portion of debt $ 27 $ 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 $ 110 110
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 $ 263 268
Interest rate 3.967%  
Other    
Debt Instrument [Line Items]    
Long-term debt $ 176 154
Senior notes    
Debt Instrument [Line Items]    
Long-term debt 29,170 30,065
Senior notes | 4.15%, due August 2026 | Colorado Interstate Gas Company    
Debt Instrument [Line Items]    
Current portion of debt $ 375 375
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 $ 578 0
Interest rate 2.25%  
Change to debt as a result of changes in exchange rate $ 35 44
Senior notes | 7.00%, due March 2027 | TGP    
Debt Instrument [Line Items]    
Current portion of debt $ 300 $ 0
Interest rate 7.00%