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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]  
Commitments under coal, gas and transportation contractual agreements As of December 31, 2021, the Company's minimum commitments under such outstanding agreements are estimated as follows:
Period(In millions)
2022$122 
202354 
202463 
202562 
202651 
Thereafter26 
Total(a)
$378 
(a)Actual fuel and transportation purchases are significantly higher than these estimated minimum unconditional long-term firm commitments with remaining term in excess of one year
Minimum purchase commitment obligations under purchased power agreements These contracts are not included in the consolidated balance sheet as of December 31, 2021. Minimum purchase commitment obligations are as follows as of December 31, 2021:
Period(In millions)
2022$1,566 
20231,036 
2024617 
2025382 
2026289 
Thereafter1,071 
Total(a)
$4,961 
(a)Actual energy purchases are significantly higher than these estimated minimum unconditional long-term firm commitments with remaining term in excess of one year