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Capitalization - Narrative (Details) - USD ($) |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Aug. 01, 2019 | Jul. 22, 2019 | Jan. 22, 2018 | Sep. 30, 2019 | Jul. 31, 2019 | Jan. 31, 2019 | Sep. 30, 2018 | Jul. 31, 2018 | Mar. 31, 2018 | Jan. 31, 2018 | Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared (in usd per share) |  |  |  |  | $ 0.38 | $ 0.38 |  | $ 0.36 | $ 0.36 | $ 0.36 | $ 0.36 |  | $ 0.38 |  |  |  |
Proceeds from issuance of equity |  |  |  | $ 2,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ 100 |  |  | $ 100 | 100 |  |  |  |  |  |  | $ 100 |  |  | $ 100 |  | $ 100
Amount of private placement shares |  |  |  | 30,120,482 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | 0.1 |  |  | $ 0.10 | 0.1 |  |  |  |  |  |  | $ 0.1 |  |  | $ 0.1 |  | $ 0.1
Amount of private placement |  |  |  | $ 850,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of beneficial conversion |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 35,000,000 | $ 0 | $ 296,000,000 |
Liquidation preference value |  |  |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ 27.42 |  |  |  | $ 27.42 |  |  |  |  |  |  | $ 27.42 |  |  | $ 27.42 |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares converted (in shares) | 1,616,000 |  | 28,302 |  |  |  | 494,767 |  |  |  |  |  |  |  |  |  | 911,411
OPIC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of private placement |  |  |  | 847,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of private placement shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33,238,910
Amount of private placement |  |  |  | $ 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) | 58,935,078 | 6,619,985 | 1,032,165 |  |  |  | 18,044,018 |  |  |  |  |  |  |  |  |  |
Series A Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares issued (in shares) | 1,616,000 |  |  | 1,616,000 | 1,616,000 |  |  |  |  |  |  | 1,616,000 |  |  | 1,616,000 |  | 1,616,000
Amount of preferred stock investment |  |  |  | $ 1,620,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares outstanding (in shares) | 0 | 181,520 |  |  | 0 |  |  |  |  |  |  | 0 |  |  | 0 |  | 704,589
Conversion cap (percent) | 4.90% |  |  |  | 4.90% |  |  |  |  |  |  | 4.90% |  |  | 4.90% |  |
Series A Convertible Preferred Stock | Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of preferred stock investment |  |  |  | 162,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Series A Convertible Preferred Stock | OPIC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of preferred stock investment |  |  |  | $ 1,460,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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