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Fair Value of Financial Investments (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 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 | $ 4,000,000 | $ 0 | $ 4,000,000 | $ 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 | 3,100,000,000 |  | 3,100,000,000 |  |  | $ 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 | 140,000,000 |  | $ 140,000,000 |  |  |
ACProducts Holding, Inc |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Preferred stock, liquidation preference, value | $ 150,000,000 |  | $ 150,000,000 |  |  |

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