XML 57 R45.htm IDEA: XBRL DOCUMENT v3.22.0.1
Long term debt (Tables)
 12 Months Ended
Dec. 31, 2021
Long-term Debt, Unclassified [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
Long-term debt consists of the following (in millions):
 As of December 31,
  20212020
First Mortgage Bonds, rates range from 1.82% to 6.88%, with a weighted average rate of 4.11%% in 2021 and 4.14% in 2020, due at various dates through 2051
$3,180 $2,940 
Pollution Control Revenue Bonds, rates at 2.13% and 2.38%, due 2033
119 119 
Total long-term debt3,299 3,059 
Less: Unamortized debt expense(14)(13)
Less: Current portion of long-term debt— (160)
Long-term debt, net of current portion$3,285 $2,886 
Schedule of Maturities of Long-term Debt [Table Text Block]
As of December 31, 2021, the future minimum principal payments on long-term debt are as follows (in millions):
Years ending December 31: 
2022$— 
2023— 
202480 
2025— 
2026— 
Thereafter3,219 
$3,299