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Long-Term and Short-Term Debt (Schedule of Debt) (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Weighted-average coupon rate   3.82%
Total principal $ 3,620 $ 5,152
Securities due within one year 0 (14)
Unamortized discount, premium and debt issuance costs, net (32) (36)
Finance leases 27  
Total long-term debt 3,608 5,132
First Mortgage Bonds    
Debt Instrument [Line Items]    
Total principal $ 3,267  
First Mortgage Bonds | DESC    
Debt Instrument [Line Items]    
Weighted-average coupon rate [1],[2] 5.42%  
Total principal [1] $ 3,267 4,990
Tax Exempt Financings Variable Rate Due 2038 | DESC    
Debt Instrument [Line Items]    
Weighted-average coupon rate [2] 1.65%  
Total principal $ 35 35
Tax Exempt Financings Variable Rate Due 2038 | Genco    
Debt Instrument [Line Items]    
Weighted-average coupon rate [2] 1.65%  
Total principal $ 33 33
Tax Exempt Financings 3.625% and 4.00% Due 2028 and 2033 | DESC    
Debt Instrument [Line Items]    
Weighted-average coupon rate [2] 3.90%  
Total principal $ 54 54
Other Debt    
Debt Instrument [Line Items]    
Total principal $ 231  
Other Debt | DESC    
Debt Instrument [Line Items]    
Weighted-average coupon rate [2] 3.69%  
Total principal $ 1 0
5.49% Senior Secured Note Due 2024 | Genco    
Debt Instrument [Line Items]    
Total principal $ 0 40
3.05% Affiliated Note Due 2024 | Genco    
Debt Instrument [Line Items]    
Weighted-average coupon rate [2],[3] 3.05%  
Total principal [3] $ 230 0
Finance Lease    
Debt Instrument [Line Items]    
Finance leases $ 20 $ 30
[1] In February, March and September 2019, DESC purchased certain of its first mortgage bonds having an aggregate purchase price of $1.8 billion pursuant to tender offers. The February and March tender offers expired in the first quarter of 2019 and the September tender offer expired in the third quarter of 2019
[2] Represents weighted-average coupon rates for debt outstanding as of December 31, 2019.
[3] In May 2019, GENCO redeemed its 5.49% senior secured notes due in 2024 at the remaining principal outstanding of $33 million plus accrued interest