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Borrowings and Other Financing Instruments Borrowings and Other Financing Instruments, Capital Stock (Details) - $ / shares | Dec. 31, 2018 | Jun. 29, 2018 | Dec. 31, 2017
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Debt Instrument [Line Items] |  |  |
Preferred Stock, Shares Authorized (in shares) | 10,000,000 |  |
Preferred Stock, Par Value (in dollars per share) | $ 1 |  |
Preferred Stock, Shares Outstanding (in shares) | 0 |  |
Common Stock, Shares Outstanding (in shares) |  | 508,898,420 |
Xcel Energy Inc. |  |  |
Debt Instrument [Line Items] |  |  |
Preferred Stock, Shares Authorized (in shares) | 7,000,000 |  |
Preferred Stock, Par Value (in dollars per share) | $ 100 |  |
Preferred Stock, Shares Outstanding (in shares) | 0 |  | 0
Common Stock, Shares Authorized (in shares) | 1,000,000,000 |  |
Common Stock, Par Value (in dollars per share) | $ 2.50 |  |
Common Stock, Shares Outstanding (in shares) | 514,036,787 |  | 507,762,881
PSCo |  |  |
Debt Instrument [Line Items] |  |  |
Preferred Stock, Shares Authorized (in shares) | 10,000,000 |  |
Preferred Stock, Par Value (in dollars per share) | $ 0.01 |  |
Preferred Stock, Shares Outstanding (in shares) | 0 |  | 0
SPS |  |  |
Debt Instrument [Line Items] |  |  |
Preferred Stock, Shares Outstanding (in shares) |  |  | 0

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