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Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions | Total | Retained Earnings [Member] | AOCI Attributable to Parent [Member] | Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Common Stock Held in Treasury, at Cost [Member] | Noncontrolling Interest [Member] | Parent Company [Member] | Parent Company [Member] Retained Earnings [Member] | Parent Company [Member] AOCI Attributable to Parent [Member] | Parent Company [Member] Additional Paid-in Capital [Member] | Parent Company [Member] Common Stock Held in Treasury, at Cost [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2017 | $ 1,645 | $ 1,234 | $ (52) | $ 0 | $ 0 | $ 200 | $ 0 | $ 264 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Total comprehensive income (loss) | 274 | 267 | 6 | 0 | 0 | 0 | 0 | 0 | $ 192 | $ 186 | $ 6 |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 0 |  |  |  |  |  |  |  | 0 |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | Accounting Standards Update 2016-01 [Member] |  | 3 | (3) |  |  |  |  |  |  |  |  |  |
Cost of warrants acquired | 12 | 0 | 0 | 0 | 0 | 12 | 0 | 0 | 12 |  |  | $ 12 |
Issuance of common stock | (1) | (1) | 0 | 0 | 0 | 0 | 0 | 0 | (1) | (1) |  |  | $ 0
Ending balance at Dec. 31, 2018 | 1,633 | 1,421 | (49) | 0 | 0 | 219 | 0 | 41 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
AMPS Impact on Stockholders Equity | (297) | (82) | 0 | 0 | 0 | 8 | 0 | (223) | 8 |  |  | 8 |
Total comprehensive income (loss) | (125) | (216) | 91 | 0 | 0 | 0 | 0 | 0 | (125) | (216) | 91 |  |
Cost of warrants acquired | 12 | 0 | 0 | 0 | 0 | 12 | 0 | 0 | 12 |  |  | 12 | 0
Issuance of common stock | (3) | (3) | 0 | 0 | 0 | 0 | 0 | 0 | (3) | (3) |  |  | 0
Ending balance at Dec. 31, 2019 | 1,536 | 1,203 | 42 | 0 | 0 | 232 | 0 | 60 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
AMPS Impact on Stockholders Equity | 19 | 0 | 0 | 0 | 0 | 0 | 0 | 19 |  |  |  |  |
Redeemable Noncontrolling Interest, Equity, Other, Fair Value | 0 |  |  |  |  |  |  |  |  |  |  |  |
Total comprehensive income (loss) | (400) | (437) | 37 | 0 | 0 | 0 | 0 | 0 | (400) | (437) | $ 37 |  |
Cost of warrants acquired | 11 | 0 | 0 | 0 | 0 | 11 | 0 | 0 | 11 |  |  | $ 11 |
Issuance of common stock | (3) | (2) | 0 | 0 | 0 | 0 | (1) | 0 | $ (3) | $ (2) |  |  | $ (1)
Ending balance at Dec. 31, 2020 | 1,140 | 759 | $ 79 | $ 0 | $ 0 | $ 242 | $ (1) | $ 60 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Increase from Subsidiary Equity Issuance | 7 |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2016-13 [Member] | (4) | $ (4) |  |  |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest, Equity, Other, Fair Value | $ 7 |  |  |  |  |  |  |  |  |  |  |  |

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