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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Billions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Feb. 28, 2019
Stockholders Equity [Abstract] |  |  |  |  |  |
Percentage of increase to quarterly dividend | 12.50% |  |  |  | 12.50% |
Common stock dividends, rate per share | $ 0.09 | $ 0.08 | $ 0.08 | $ 0.06 |  |
Share Repurchase Program [Member] |  |  |  |  |  |
Stockholders Equity [Abstract] |  |  |  |  |  |
Share-repurchase program, additional authorized amount |  |  | $ 3.0 |  |  | $ 1.0
Share-repurchase program expiration date |  |  |  |  | Dec. 31, 2019 |
Share Repurchase Program [Member] | Maximum [Member] |  |  |  |  |  |
Stockholders Equity [Abstract] |  |  |  |  |  |
Share-repurchase program, authorized amount |  |  |  | $ 1.0 |  | $ 5.0

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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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