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Equity Equity (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 31 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Jan. 01, 2018
Statement of Equity Table [Line Items] |  |  |  |  |  |
Beginning Balance |  |  | 131,636,870 |  |  |
Repurchase of common stock | (4,700,000) |  | (12,500,000) |  | (29,000,000) |
Ending Balance | 119,932,166 |  | 119,932,166 |  | 119,932,166 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Beginning Balance | $ 2,442 | $ 2,423 | $ 2,622 | $ 2,469 |  |
Cumulative effect of adoption of new accounting pronouncements |  |  |  |  |  | $ (22)
Net income | 104 | 96 | 161 | 178 |  |
Other comprehensive income | 0 | 1 | (1) | 3 |  |
Repurchase of common stock | (102) | (59) | (302) | (180) | $ (776) |
Exercise of stock options | 0 | 4 | 0 | 7 |  |
Stock-based compensation | 10 | 13 | 31 | 38 |  |
Shares withheld for taxes on equity awards | 0 | (1) | (10) | (10) |  |
Dividends declared, APIC | (11) | (12) | (34) | (37) |  |
Dividends declared | (11) | (12) | (36) | (40) |  |
Ending Balance | $ 2,443 | $ 2,465 | $ 2,443 | $ 2,465 | $ 2,443 |
Common Stock [Member] |  |  |  |  |  |
Statement of Equity Table [Line Items] |  |  |  |  |  |
Beginning Balance | 124,600,000 | 0 | 131,600,000 | 0 |  |
Repurchase of common stock | (4,700,000) | 0 | (12,500,000) | 0 |  |
Exercise of stock options, Shares | 0 | 0 | 0 | 0 |  |
Exercise of stock options, Value | $ 0 | $ 0 | $ 0 | $ 0 |  |
Issuance of shares for vesting of equity awards | 0 | 0 | 1,200,000 | 0 |  |
Shares withheld for taxes on equity awards | 0 | 0 | (400,000) | 0 |  |
Ending Balance | 119,900,000 | 0 | 119,900,000 | 0 | 119,900,000 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Beginning Balance | $ 1 | $ 1 | $ 1 | $ 1 |  |
Repurchase of common stock | 0 | 0 | 0 | 0 |  |
Issuance of shares for vesting of equity awards | 0 | 0 | 0 | 0 |  |
Shares withheld for taxes on equity awards | 0 | 0 | 0 | 0 |  |
Ending Balance | 1 | 1 | 1 | 1 | $ 1 |
Additional Paid-in Capital [Member] |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Beginning Balance | 5,073 | 5,438 | 5,285 | 5,565 |  |
Repurchase of common stock | (102) | (59) | (302) | (180) |  |
Exercise of stock options | 0 | 4 | 0 | 7 |  |
Stock-based compensation | 10 | 13 | 31 | 38 |  |
Shares withheld for taxes on equity awards | 0 | (1) | (10) | (10) |  |
Ending Balance | 4,970 | 5,383 | 4,970 | 5,383 | 4,970 |
Retained Earnings |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Beginning Balance | (2,588) | (2,981) | (2,631) | (3,062) |  |
Cumulative effect of adoption of new accounting pronouncements |  |  |  |  |  | (13)
Net income | 103 | 95 | 159 | 176 |  |
Ending Balance | (2,485) | (2,886) | (2,485) | (2,886) | (2,485) |
AOCI Attributable to Parent |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Beginning Balance | (47) | (38) | (37) | (40) |  |
Cumulative effect of adoption of new accounting pronouncements |  |  |  |  |  | $ (9)
Other comprehensive income | 0 | 1 | (1) | 3 |  |
Ending Balance | (47) | (37) | (47) | (37) | (47) |
Noncontrolling Interest [Member] |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Beginning Balance | 3 | 3 | 4 | 5 |  |
Net income | 1 | 1 | 2 | 2 |  |
Dividends declared, Noncontrolling Interest | 0 | 0 | (2) | (3) |  |
Ending Balance | $ 4 | $ 4 | $ 4 | $ 4 | $ 4 |

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