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Equity Items - Additional Information (Details) - USD ($) | 3 Months Ended
--- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017
Accelerated Share Repurchases [Line Items] |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ 0.25 | $ 0.25 | $ 0.25 | $ 0.225 | $ 0.225
Common Stock, Dividends Declared, Paid | $ 16,000,000 | $ 16,000,000 | $ 16,000,000 |  | $ 14,000,000
2018 Stock Repurchase Program [Member] |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  | $ 1,000,000,000 |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 1,000,000,000 |  |  |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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