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Summary of Significant Accounting Policies (Accounts Payable and Supplier Invoices Sold) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Payables [Line Items]    
Confirmed obligations outstanding at beginning of period $ 13 $ 50
Invoices confirmed during the period 71 156
Confirmed invoices paid during the period (61) (193)
Confirmed obligations outstanding at end of period 23 13
Piedmont    
Payables [Line Items]    
Confirmed obligations outstanding at beginning of period 12 47
Invoices confirmed during the period 69 152
Confirmed invoices paid during the period (58) (187)
Confirmed obligations outstanding at end of period $ 23 $ 12