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Subsequent Events (Unaudited) (Details) - USD ($) shares in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 5 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 04, 2016 | Jul. 29, 2016 | Jan. 05, 2016 | Aug. 04, 2016 | Jul. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2016 | Jun. 30, 2016 | Jun. 30, 2015 | Jan. 05, 2016 | Dec. 31, 2015
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock |  |  | $ 1,970,000,000 |  |  |  |  |  | $ 32,000,000 | $ 0 |  |
Stock Issued During Period, Shares, New Issues |  |  | 4 |  |  |  | 17 |  |  |  | 210 | 206
Fees and Commissions |  |  | $ 20,000,000 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock, Gross |  |  |  |  | $ 226,000,000 |  |  |  |  |  |  |
Subsequent Event, Date |  |  |  |  |  | Jul. 27, 2016 |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 8 | 3 |  |  |  |  |  |  |
Common Stock, Value of Shares Authorized for Issue in Transaction |  | $ 12,000,000 |  |  |  |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock, Gross |  |  | $ 32,000,000 |  |  |  |  |  |  |  |  | $ 2,000,000,000
Stock Issued During Period, Shares, New Issues |  |  |  |  |  |  |  |  | 70 |  |  |
Common Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock, Gross | $ 167,000,000 |  |  | $ 85,000,000 |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock | 166,000,000 |  |  |  |  |  |  |  |  |  |  |
Common Stock, Value of Shares Authorized for Issue in Transaction | 12.69 |  |  |  |  |  |  |  |  |  |  |
Fees and Commissions | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |
Common Stock [Member] | Maximum [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock, Gross |  |  |  |  |  |  |  | $ 1,500,000,000 |  |  |  |
Stock Issued During Period, Shares, New Issues | 13 |  |  |  |  |  |  |  |  |  |  |

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