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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]  
Commitments under coal, gas and transportation contractual agreements
As of December 31, 2020, the Company's minimum commitments under such outstanding agreements are estimated as follows:
Period(In millions)
2021$146 
202298 
202369 
202467 
202565 
Thereafter80 
Total(a)
$525 
(a)Actual coal, gas and transportation purchases are significantly higher than these estimated minimum unconditional long-term firm commitments
Minimum purchase commitment obligations under purchased power agreements These contracts are not included in the consolidated balance sheet as of December 31, 2020. Minimum purchase commitment obligations are as follows as of December 31, 2020:
Period(In millions)
2021$48 
202262 
202350 
202450 
202549 
Thereafter316 
Total(a)
$575 
(a)Actual power purchases are significantly higher than these estimated minimum unconditional long-term firm commitments