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Fair Value of Financial Investments (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Feb. 18, 2020
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Investments, fair value disclosure         $ 136,000,000  
Dividend income $ 3,000,000 $ 0 $ 7,000,000 $ 0    
Estimate of Fair Value Measurement            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Estimated market value of long-term and short-term debt 3,200,000,000   3,200,000,000     $ 3,000,000,000.0
Carrying Value Reported Value Measurement            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Aggregate carrying value of long-term and short-term debt 2,800,000,000   $ 2,800,000,000     $ 2,800,000,000
ACProducts Preferred Stock            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Preferred stock, coupon rate, percentage until first anniversary issuance     8.00%      
Preferred stock, coupon rate, percentage after the first anniversary until the second anniversary issuance     9.00%      
Preferred stock, coupon rate, percentage after the second anniversary until the seventh anniversary issuance     10.00%      
Preferred stock, percentage of coupon rate increase     5000.00%      
Preferred stock, coupon rate, maximum percentage     15.00%      
ACProducts Preferred Stock | Other Assets            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Investments 143,000,000   $ 143,000,000      
ACProducts Holding, Inc            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Preferred stock, liquidation preference, value $ 150,000,000   $ 150,000,000