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Capitalization - Changes in Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Jul. 31, 2019 | Sep. 30, 2018 | Jul. 31, 2018 | Mar. 31, 2018 | Jan. 31, 2018 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jan. 01, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ 7,269 |  | $ 7,699 |  | $ 3,925 | $ 7,269 | $ 6,932 | $ 6,814 | $ 7,699 | $ 7,375 | $ 3,925 | $ 6,814 | $ 3,925 |
Beginning balance, shares |  |  |  |  |  |  |  |  | 511,915,450 |  |  |  | 511,915,450 |  |
Net income |  |  |  |  |  |  | 391 | 312 | $ 320 | (458) | 299 | 1,369 | $ 1,023 | 1,210 |
Other comprehensive loss, net of tax |  |  |  |  |  |  | (4) | (5) | (5) | (12) | (13) | (56) | (14) | (81) |
Stock-based compensation |  |  |  |  |  |  | 7 | 9 | 7 | 10 | 19 | 19 |  |  |
Stock Investment Plan and certain share-based benefit plans |  |  |  |  |  |  | 20 | 21 | 1 | 21 | 19 | 6 |  |  |
Cash dividends declared on common stock ($0.36/common share in January and March) |  |  |  |  |  |  | (411) |  | (202) | (368) |  | (343) |  |  |
Cash dividends declared on preferred stock ($0.36/as-converted share in January and March) |  |  |  |  |  |  |  |  | (3) | (19) |  | (42) |  |  |
Stock issuance |  |  |  |  |  |  |  |  |  |  |  | 2,462 |  |  |
Impact of adopting new accounting pronouncements |  |  |  |  |  |  |  |  |  |  |  | 35 |  |  |
Conversion of Series A Convertible Preferred Stock |  |  |  |  |  |  | 0 |  | 0 | 0 |  |  |  |  |
Ending balance | $ 7,272 |  | $ 6,873 |  | $ 7,375 |  | $ 7,272 | 7,269 | $ 6,932 | 6,873 | 7,699 | $ 7,375 | $ 7,272 | 6,873 |
Ending balance, shares | 540,311,707 |  |  |  |  |  | 540,311,707 |  |  |  |  |  | 540,311,707 |  |
Amount of beneficial conversion |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | 296 |
Amortization of beneficial conversion |  |  |  |  |  |  | $ 0 |  |  | $ 35 |  |  | 0 | 296 |
Dividends declared (in usd per share) | $ 0.38 | $ 0.38 | $ 0.36 | $ 0.36 | $ 0.36 | $ 0.36 |  |  | $ 0.38 |  |  |  |  |  |
Preferred stock dividends declared (in usd per share) |  |  |  |  |  |  |  |  | $ 0.38 | $ 0.36 |  | $ 0.36 |  |  |
Series A Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ 21 |  | $ 162 |  | $ 0 | $ 21 | $ 21 | $ 71 | $ 162 | $ 162 | $ 0 | $ 71 | $ 0 |
Beginning balance, shares |  | 200,000 |  | 1,600,000 |  | 0 | 200,000 | 200,000 | 700,000 | 1,600,000 | 1,600,000 | 0 | 700,000 | 0 |
Stock issuance |  |  |  |  |  |  |  |  |  |  |  | $ 162 |  |  |
Stock issuance, shares |  |  |  |  |  |  |  |  |  |  |  | 1,600,000 |  |  |
Conversion of Series A Convertible Preferred Stock |  |  |  |  |  |  | $ (21) |  | $ (50) | $ (92) |  |  |  |  |
Conversion of Series A Convertible Preferred Stock, shares |  |  |  |  |  |  | (200,000) |  | (500,000) | (900,000) |  |  |  |  |
Ending balance | $ 0 |  | $ 70 |  | $ 162 |  | $ 0 | $ 21 | $ 21 | $ 70 | $ 162 | $ 162 | $ 0 | $ 70 |
Ending balance, shares | 0 |  | 700,000 |  | 1,600,000 |  | 0 | 200,000 | 200,000 | 700,000 | 1,600,000 | 1,600,000 | 0 | 700,000 |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ 53 |  | $ 48 |  | $ 44 | $ 53 | $ 53 | $ 51 | $ 48 | $ 48 | $ 44 | $ 51 | $ 44 |
Beginning balance, shares |  | 532,000,000 |  | 478,000,000 |  | 445,000,000 | 532,000,000 | 531,000,000 | 512,000,000 | 478,000,000 | 477,000,000 | 445,000,000 | 512,000,000 | 445,000,000 |
Stock Investment Plan and certain share-based benefit plans |  |  |  |  |  |  |  |  |  |  |  | $ 1 |  |  |
Stock Investment Plan and certain share-based benefit plans, shares |  |  |  |  |  |  | 1,000,000 | 1,000,000 | 1,000,000 | 1,000,000 | 1,000,000 | 2,000,000 |  |  |
Stock issuance |  |  |  |  |  |  |  |  |  |  |  | $ 3 |  |  |
Stock issuance, shares |  |  |  |  |  |  |  |  |  |  |  | 30,000,000 |  |  |
Conversion of Series A Convertible Preferred Stock |  |  |  |  |  |  | $ 1 |  | $ 2 | $ 3 |  |  |  |  |
Conversion of Series A Convertible Preferred Stock, shares |  |  |  |  |  |  | (7,000,000) |  | (18,000,000) | (33,000,000) |  |  |  |  |
Ending balance | $ 54 |  | $ 51 |  | $ 48 |  | $ 54 | $ 53 | $ 53 | $ 51 | $ 48 | $ 48 | $ 54 | $ 51 |
Ending balance, shares | 540,000,000 |  | 512,000,000 |  | 477,000,000 |  | 540,000,000 | 532,000,000 | 531,000,000 | 512,000,000 | 478,000,000 | 477,000,000 | 540,000,000 | 512,000,000 |
OPIC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ 11,411 |  | $ 11,975 |  | $ 10,001 | $ 11,411 | $ 11,381 | $ 11,530 | $ 11,975 | $ 11,937 | $ 10,001 | $ 11,530 | $ 10,001 |
Stock-based compensation |  |  |  |  |  |  | 7 | 9 | 7 | 10 | 19 | 19 |  |  |
Stock Investment Plan and certain share-based benefit plans |  |  |  |  |  |  | 20 | 21 | 1 | 21 | 19 | 5 |  |  |
Cash dividends declared on common stock ($0.36/common share in January and March) |  |  |  |  |  |  | (411) |  | (202) | (368) |  | (343) |  |  |
Cash dividends declared on preferred stock ($0.36/as-converted share in January and March) |  |  |  |  |  |  |  |  | (3) | (19) |  | (42) |  |  |
Stock issuance |  |  |  |  |  |  |  |  |  |  |  | 2,297 |  |  |
Conversion of Series A Convertible Preferred Stock |  |  |  |  |  |  | 20 |  | 48 | 89 |  |  |  |  |
Ending balance | $ 11,047 |  | $ 11,708 |  | $ 11,937 |  | 11,047 | 11,411 | 11,381 | 11,708 | 11,975 | 11,937 | 11,047 | 11,708 |
Amount of beneficial conversion |  |  |  |  |  |  |  |  |  | 296 |  |  |  |  |
AOCI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 31 |  | 73 |  | 142 | 31 | 36 | 41 | 73 | 86 | 142 | 41 | 142 |
Other comprehensive loss, net of tax |  |  |  |  |  |  | (4) | (5) | (5) | (12) | (13) | (56) |  |  |
Ending balance | 27 |  | 61 |  | 86 |  | 27 | 31 | 36 | 61 | 73 | 86 | 27 | 61 |
Accumulated Deficit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ (4,247) |  | $ (4,559) |  | $ (6,262) | (4,247) | (4,559) | (4,879) | (4,559) | (4,858) | (6,262) | (4,879) | (6,262) |
Net income |  |  |  |  |  |  | 391 | 312 | 320 | (458) | 299 | 1,369 |  |  |
Impact of adopting new accounting pronouncements |  |  |  |  |  |  |  |  |  |  |  | 35 |  |  |
Ending balance | $ (3,856) |  | $ (5,017) |  | $ (4,858) |  | $ (3,856) | $ (4,247) | $ (4,559) | $ (5,017) | $ (4,559) | $ (4,858) | $ (3,856) | $ (5,017) |
ASU 2016-01 | Accumulated Deficit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effect of new accounting principle in period of adoption |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 57
ASU 2018-02 | Accumulated Deficit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effect of new accounting principle in period of adoption |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 22

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