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Stockholders' Equity Preferred and Common Stock (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Stockholders' Equity Note [Abstract] |  |  |
Preferred stock shares authorized (in shares) | 2,000,000,000.0 |  | 2,000,000,000.0
Common stock shares authorized (in shares) | 5,000,000,000.0 |  | 5,000,000,000.0
Common stock shares issued (in shares) | 1,500,000,000 |  | 1,500,000,000
Common stock shares outstanding (in shares) | 1,500,000,000 |  | 1,500,000,000
Common stock shares purchased (in shares) | 0 | 10,000,000 |
Common stock shares purchased amount |  | $ 300 |
Total dividends paid on common stock | $ 573 | $ 587 |

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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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