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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Basic |  |
Income from continuing operations | $ 2,157 | $ 1,116
Less: cumulative dividends on subsidiary preferred stock | (38) | (14)
Income from continuing operations attributable to common stockholders | 2,119 | 1,102
Loss from discontinued operations, net of tax | 0 | 70
Net income attributable to common stockholders | $ 2,119 | $ 1,032
Weighted-average common shares outstanding - basic (in shares) | 1,417 | 1,408
Basic earnings per common share – continuing operations (in dollars per share) | $ 1.50 | $ 0.78
Basic loss per common share – discontinued operations (in dollars per share) | 0.00 | 0.05
Basic earnings per common share (in dollars per share) | $ 1.50 | $ 0.73
Diluted |  |
Income from continuing operations attributable to common stockholders – diluted | $ 2,119 | $ 1,102
Loss from discontinued operations, net of tax – diluted | 0 | 70
Net income attributable to common stockholders – diluted | $ 2,119 | $ 1,032
Weighted-average common shares outstanding - basic (in shares) | 1,417 | 1,408
Dilutive effect of warrants and awards under stock incentive plans (in shares) | 19 | 22
Weighted-average common shares outstanding - diluted (in shares) | 1,436 | 1,430
Diluted earnings per common share – continuing operations (in dollars per share) | $ 1.48 | $ 0.77
Diluted loss per common share – discontinued operations (in dollars per share) | 0.00 | 0.05
Diluted earnings per common share (in dollars per share) | $ 1.48 | $ 0.72
Potentially dilutive securities (in shares) | 8 | 4

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1448-109256 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration