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Shareholders' Equity And Net Income Per Share Dividends (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 22, 2017 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments of Cash Dividends |  |  | $ 58 | $ 58 | $ 58 | $ 59 | $ 77 | $ 77 | $ 78 | $ 78 | $ 233 | $ 310
Common Stock, Dividends, Per Share, Cash Paid |  |  | $ 0.22 | $ 0.22 | $ 0.22 | $ 0.22 | $ 0.29 | $ 0.29 | $ 0.29 | $ 0.29 | $ 0.88 | $ 1.16
Record Date | Nov. 22, 2017 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per share |  | $ 0.22 |  |  |  |  |  |  |  |  |  |

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- Definition Aggregate dividends paid 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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