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Shareholders' Equity And Net Income Per Share Dividends (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Cash dividends declared per share |  | $ 0.22 |  |  |  | $ 0.29 |  |  | $ 0.44 | $ 0.87 |
Cash dividends per share |  | $ 0.22 | $ 0.22 | $ 0.22 | $ 0.29 | $ 0.29 | $ 0.29 | $ 0.29 | $ 0.66 |  | $ 1.16
Payments of Cash Dividends |  | $ 58 | $ 58 | $ 59 | $ 77 | $ 77 | $ 78 | $ 78 | $ 175 |  | $ 310
Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per share | $ 0.22 |  |  |  |  |  |  |  |  |  |

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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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