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Stockholder's Equity - Narrative (Details) - USD ($) | 1 Months Ended | 2 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Jul. 31, 2018 | Jul. 31, 2017 | Feb. 14, 2019 | Dec. 31, 2011 | Feb. 13, 2019 | Dec. 14, 2018 | Dec. 31, 2017
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Preferred stock, par value (in usd per share) | $ 0.001 |  |  |  |  |  |  | $ 0.001
Preferred stock, shares outstanding (in shares) | 70,000 |  |  |  |  |  |  | 70,000
Class of warrant or right, exercise price of warrants or rights (in usd per share) |  |  |  |  | $ 7 |  |  |
Class of warrant or right, number of securities called by warrants or rights (in shares) | 10,000,000 |  |  |  |  |  |  |
Number of shares issued in transaction (in shares) |  |  | 11,000,000 |  |  |  |  |
Stock repurchase program authorized amount |  |  |  |  |  |  | $ 1,000,000,000 |
Shares repurchased and retired (in shares) | 10,000,000 |  |  |  |  |  |  |
Aggregate value of shares repurchased and retired | $ 536,000,000 |  |  |  |  |  |  |
Shares repurchased, average price per share (in usd per share) | $ 53.46 |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Stock repurchase program authorized amount |  |  |  |  |  | $ 1,500,000,000.0 |  |
Shares repurchased and retired (in shares) |  |  |  | 8,000,000 |  |  |  |
Aggregate value of shares repurchased and retired |  |  |  | $ 464,000,000 |  |  |  |
Shares repurchased, average price per share (in usd per share) |  |  |  | $ 59.47 |  |  |  |
Convertible Preferred Stock |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Preferred stock, par value (in usd per share) | $ 0.001 |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | 0 |  |  |  |  |  |  |
Proceeds from issuance of preferred stock |  |  |  |  | $ 75,000,000 |  |  |
Proceeds from issuance of preferred stock, net of issuance costs (in shares) |  |  |  |  | 75,000 |  |  |
Temporary equity, liquidation preference (in usd per share) |  |  |  |  | $ 1,000 |  |  |
Class of warrant or right, exercise price of warrants or rights (in usd per share) |  |  |  |  | $ 7 |  |  |
Class of warrant or right, number of securities called by warrants or rights (in shares) | 10,000,000 |  |  |  |  |  |  |
Preferred stock, liquidation preference, percentage |  |  |  |  | 4.00% |  |  |
Offered Directly By The Company |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Number of shares issued in transaction (in shares) |  |  | 5,000,000 |  |  |  |  |
Sale of stock, price per share (in usd per share) |  |  | $ 60.50 |  |  |  |  |
Gross proceeds received |  |  | $ 290,000,000 |  |  |  |  |
Gross proceeds received net of fees and expenses |  | $ 349,000,000 | $ 288,000,000 |  |  |  |  |
Offered In Connection With Forward Sale Agreements |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Number of shares issued in transaction (in shares) |  | 6,000,000 | 6,000,000 |  |  |  |  |
Sale of stock, price per share (in usd per share) |  |  | $ 58.08 |  |  |  |  |
Offered In Connection With Forward Sale Agreements | Morgan Stanley & Co. LLC |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Number of shares issued in transaction (in shares) |  |  | 3,000,000 |  |  |  |  |

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