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Subsequent Events (Details) - $ / shares | Mar. 26, 2018 | Mar. 22, 2018 | Jan. 25, 2018 | Dec. 31, 2017 | Jul. 13, 2017 | Dec. 31, 2016
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Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |
Number of shares |  |  |  | 99,444,132,192 |  | 97,624,347,430
Par value |  |  |  | $ 0 | $ 0 | $ 0
Declaration of dividends |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |
Proposed dividend per share |  | $ 3.14655951692 | $ 3.14655951692 |  |  |
Number of shares |  |  | 99,444,132,192 |  |  |
Proposed dividend (as a percent) |  |  | 60.00% |  |  |
Capitalization of net distributable income (as a percent) | 40.00% | 40.00% | 40.00% |  |  |
Shares issued, value per share |  | $ 93.73 | $ 93.73 |  |  |
Proposed stock dividend per share |  | 0.02238030880 | 0.02238030880 |  |  |
Par value |  | $ 0 |  |  |  |

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