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Equity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2018 | Jun. 30, 2017
Dividends Payable [Line Items] |  |  |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid | [1] |  | $ 1.050 | $ 1.050 |  |
Preferred Stock, Dividends Per Share, Declared |  | $ 17.1875 | $ 17.1875 | $ 17.1875 |  |
Dividends, Common Stock, Cash | [1] |  | $ 438 | $ 439 |  |
Dividends, Preferred Stock, Cash |  | $ 28 | $ 28 | $ 28 |  |
Common stock repurchased during period, shares |  |  |  |  | 0.3 |
Purchases of capital stock |  |  |  |  | $ 34 | $ 23
Common Stock [Member] |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |
Dividends Payable, Date Declared | [1] |  | May 17, 2018 | Feb. 21, 2018 |  |
Dividends Payable, Date of Record | [1] |  | Jun. 15, 2018 | Mar. 16, 2018 |  |
Dividends Payable, Date to be Paid | [1] |  | Jun. 29, 2018 | Mar. 30, 2018 |  |
Preferred Stock [Member] |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |
Dividends Payable, Date Declared |  | Jun. 22, 2018 | Mar. 19, 2018 | Dec. 15, 2017 |  |
Dividends Payable, Date of Record |  | Jul. 15, 2018 | Apr. 15, 2018 | Jan. 15, 2018 |  |
Dividends Payable, Date to be Paid |  | Aug. 01, 2018 | May 01, 2018 | Feb. 01, 2018 |  |
[1] | Inclusive of dividends accrued for holders of unvested restricted stock units, which will be paid when and if the restricted stock units vest.

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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