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Borrowings and Other Financing Instruments Long-Term Borrowings and Other Financing Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Long-Term Borrowings and Other Financing Instruments    
Long-term Debt, Gross $ 18,109 $ 16,209
Long-term debt   (85)
2020 702  
2021 421  
2022 900  
2023 650  
2024 552  
Long-term Debt and Lease Obligation 17,407 15,803
NSP Minnesota    
Long-Term Borrowings and Other Financing Instruments    
Unamortized discount (31) (21)
Unamortized Debt Issuance Expense (48) (42)
Current Maturities (300) 0
Long-term Debt 5,221 4,937
NSP Minnesota | Mortgage bonds | Series Due Aug. 15, 2020 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 300 300
Debt Instrument, Interest Rate, Stated Percentage 2.20%  
NSP Minnesota | Mortgage bonds | Series Due Sept. 15, 2047    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 600 600
Debt Instrument, Interest Rate, Stated Percentage 3.60%  
NSP Minnesota | Mortgage bonds | Series Due Aug. 15, 2022 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 300 300
Debt Instrument, Interest Rate, Stated Percentage 2.15%  
NSP Minnesota | Mortgage bonds | Series Due July 1, 2025 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 250 250
Debt Instrument, Interest Rate, Stated Percentage 7.13%  
NSP Minnesota | Mortgage bonds | Series Due March 1, 2028 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 150 150
Debt Instrument, Interest Rate, Stated Percentage 6.50%  
NSP Minnesota | Mortgage bonds | Series Due July 15, 2035 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 250 250
Debt Instrument, Interest Rate, Stated Percentage 5.25%  
NSP Minnesota | Mortgage bonds | Series Due June 1, 2036 [Domain]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 400 400
Debt Instrument, Interest Rate, Stated Percentage 6.25%  
NSP Minnesota | Mortgage bonds | Series Due May 15, 2023 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 400 400
Debt Instrument, Interest Rate, Stated Percentage 2.60%  
NSP Minnesota | Mortgage bonds | Series Due July 1, 2037 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 350 350
Debt Instrument, Interest Rate, Stated Percentage 6.20%  
NSP Minnesota | Mortgage bonds | Series Due Nov. 1, 2039 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 300 300
Debt Instrument, Interest Rate, Stated Percentage 5.35%  
NSP Minnesota | Mortgage bonds | Series Due Aug. 15, 2040 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 250 250
Debt Instrument, Interest Rate, Stated Percentage 4.85%  
NSP Minnesota | Mortgage bonds | Series Due Aug. 15, 2042 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 500 500
Debt Instrument, Interest Rate, Stated Percentage 3.40%  
NSP Minnesota | Mortgage bonds | Series Due May 15, 2044 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 300 300
Debt Instrument, Interest Rate, Stated Percentage 4.13%  
NSP Minnesota | Mortgage bonds | Series Due Aug. 15, 2045 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 300 300
Debt Instrument, Interest Rate, Stated Percentage 4.00%  
NSP Minnesota | Mortgage bonds | Series Due May 15, 2046 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 350 350
Debt Instrument, Interest Rate, Stated Percentage 3.60%  
NSP Minnesota | Mortgage bonds | Series Due March 1, 2050    
Long-Term Borrowings and Other Financing Instruments    
Face Amount [1] $ 600 0
Debt Instrument, Interest Rate, Stated Percentage [1] 2.90%  
Other Subsidiaries    
Long-Term Borrowings and Other Financing Instruments    
Current Maturities $ (2) (1)
Long-term Debt and Lease Obligation 26 25
Other Subsidiaries | Various Eloigne Co. affordable housing project notes    
Long-Term Borrowings and Other Financing Instruments    
Long-term Debt, Gross $ 28 $ 26
Other Subsidiaries | Various Eloigne Co. affordable housing project notes | Minimum    
Long-Term Borrowings and Other Financing Instruments    
Debt Instrument, Interest Rate, Stated Percentage 0.00% 0.00%
Other Subsidiaries | Various Eloigne Co. affordable housing project notes | Maximum    
Long-Term Borrowings and Other Financing Instruments    
Debt Instrument, Interest Rate, Stated Percentage 6.90% 7.05%
Xcel Energy Inc.    
Long-Term Borrowings and Other Financing Instruments    
Unamortized discount $ (5) $ (5)
Unamortized Debt Issuance Expense (28) (21)
Capital Lease Obligations, Current [2] 0 2
Xcel Energy Inc. | Capital lease obligations    
Long-Term Borrowings and Other Financing Instruments    
Long-term debt [2] 0 (60)
Long-term Debt and Lease Obligation 3,947 3,316
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due May 15, 2020 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount [3] $ 0 550
Debt Instrument, Interest Rate, Stated Percentage [3] 4.70%  
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due June 15, 2028    
Long-Term Borrowings and Other Financing Instruments    
Face Amount [4] $ 130 0
Debt Instrument, Interest Rate, Stated Percentage [4] 4.00%  
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due June 15, 2028 2 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount [5] $ 500 500
Debt Instrument, Interest Rate, Stated Percentage [5] 4.00%  
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due March 15, 2021 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 400 400
Debt Instrument, Interest Rate, Stated Percentage 2.40%  
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due March 15, 2022 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 300 300
Debt Instrument, Interest Rate, Stated Percentage 2.60%  
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due June 1, 2025 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 250 250
Debt Instrument, Interest Rate, Stated Percentage 3.30%  
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due June 1, 2025 2 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 350 350
Debt Instrument, Interest Rate, Stated Percentage 3.30%  
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due Dec. 1, 2026 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 500 500
Debt Instrument, Interest Rate, Stated Percentage 3.35%  
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due Dec. 1, 2029 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount [4] $ 500 0
Debt Instrument, Interest Rate, Stated Percentage [4] 2.60%  
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due July 1, 2036 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 300 300
Debt Instrument, Interest Rate, Stated Percentage 6.50%  
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due Sept. 15, 2041 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 250 250
Debt Instrument, Interest Rate, Stated Percentage 4.80%  
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due Dec. 1, 2049 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount [4] $ 500 0
Debt Instrument, Interest Rate, Stated Percentage [4] 3.50%  
NSP-Wisconsin    
Long-Term Borrowings and Other Financing Instruments    
Unamortized discount $ (3) (3)
Unamortized Debt Issuance Expense (8) (9)
Long-term Debt 808 807
NSP-Wisconsin | Mortgage bonds | Series Due September 1, 2048 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount [6] $ 200 200
Debt Instrument, Interest Rate, Stated Percentage [6] 4.20%  
NSP-Wisconsin | Mortgage bonds | Series Due Dec. 1, 2047    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 100 100
Debt Instrument, Interest Rate, Stated Percentage 3.75%  
NSP-Wisconsin | Mortgage bonds | Series Due June 15, 2024 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 100 100
Debt Instrument, Interest Rate, Stated Percentage 3.30%  
NSP-Wisconsin | Mortgage bonds | Series Due June 15, 2024 2 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 100 100
Debt Instrument, Interest Rate, Stated Percentage 3.30%  
NSP-Wisconsin | Mortgage bonds | Series Due Sept. 1, 2038 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 200 200
Debt Instrument, Interest Rate, Stated Percentage 6.38%  
NSP-Wisconsin | Mortgage bonds | Series Due Oct. 1, 2042 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 100 100
Debt Instrument, Interest Rate, Stated Percentage 3.70%  
NSP-Wisconsin | City of La Crosse resource recovery bond | Series Due Nov. 1, 2021 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 19 19
Debt Instrument, Interest Rate, Stated Percentage 6.00%  
PSCo    
Long-Term Borrowings and Other Financing Instruments    
Unamortized discount $ (24) (14)
Unamortized Debt Issuance Expense (41) (33)
Current Maturities (400) (406)
Long-term Debt and Lease Obligation 4,985 4,592
PSCo | Capital lease obligations    
Long-Term Borrowings and Other Financing Instruments    
Long-term debt [7] $ 0 $ (145)
PSCo | Capital lease obligations | Minimum    
Long-Term Borrowings and Other Financing Instruments    
Debt Instrument, Interest Rate, Stated Percentage 11.20% 11.20%
PSCo | Capital lease obligations | Maximum    
Long-Term Borrowings and Other Financing Instruments    
Debt Instrument, Interest Rate, Stated Percentage 14.30% 14.30%
PSCo | Mortgage bonds | Series Due June 1, 2019 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount [8] $ 0 $ 400
Debt Instrument, Interest Rate, Stated Percentage [3] 5.13%  
PSCo | Mortgage bonds | Series Due June 15, 2028    
Long-Term Borrowings and Other Financing Instruments    
Face Amount [9] $ 350 350
Debt Instrument, Interest Rate, Stated Percentage [3] 3.70%  
PSCo | Mortgage bonds | Series Due June 15, 2048    
Long-Term Borrowings and Other Financing Instruments    
Face Amount [9] $ 350 350
Debt Instrument, Interest Rate, Stated Percentage [3] 4.10%  
PSCo | Mortgage bonds | Series Due June 15, 2047    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 400 400
Debt Instrument, Interest Rate, Stated Percentage 3.80%  
PSCo | Mortgage bonds | Series Due March 1, 2050    
Long-Term Borrowings and Other Financing Instruments    
Face Amount [10] $ 550 0
Debt Instrument, Interest Rate, Stated Percentage [3] 3.20%  
PSCo | Mortgage bonds | Series Due Nov. 15, 2020 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 400 400
Debt Instrument, Interest Rate, Stated Percentage 3.20%  
PSCo | Mortgage bonds | Series Due Sept. 15, 2022 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 300 300
Debt Instrument, Interest Rate, Stated Percentage 2.25%  
PSCo | Mortgage bonds | Series Due March 15, 2023 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 250 250
Debt Instrument, Interest Rate, Stated Percentage 2.50%  
PSCo | Mortgage bonds | Series Due May 15, 2025 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 250 250
Debt Instrument, Interest Rate, Stated Percentage 2.90%  
PSCo | Mortgage bonds | Series Due Sept. 1, 2037 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 350 350
Debt Instrument, Interest Rate, Stated Percentage 6.25%  
PSCo | Mortgage bonds | Series Due Aug. 1, 2038 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 300 300
Debt Instrument, Interest Rate, Stated Percentage 6.50%  
PSCo | Mortgage bonds | Series Due Aug. 15, 2041 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 250 250
Debt Instrument, Interest Rate, Stated Percentage 4.75%  
PSCo | Mortgage bonds | Series Due Sept. 15, 2042 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 500 500
Debt Instrument, Interest Rate, Stated Percentage 3.60%  
PSCo | Mortgage bonds | Series Due March 15, 2043 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 250 250
Debt Instrument, Interest Rate, Stated Percentage 3.95%  
PSCo | Mortgage bonds | Series Due March 15, 2044 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 300 300
Debt Instrument, Interest Rate, Stated Percentage 4.30%  
PSCo | Mortgage bonds | Series Due June 15, 2046 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 250 250
Debt Instrument, Interest Rate, Stated Percentage 3.55%  
PSCo | Mortgage bonds | Series Due September 15, 2049    
Long-Term Borrowings and Other Financing Instruments    
Face Amount [10] $ 400 0
Debt Instrument, Interest Rate, Stated Percentage [3] 4.05%  
SPS    
Long-Term Borrowings and Other Financing Instruments    
Unamortized discount $ (7) (4)
Unamortized Debt Issuance Expense (23) (20)
Long-term Debt 2,420 2,126
SPS | Mortgage bonds | Series Due August 15, 2047    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 450 450
Debt Instrument, Interest Rate, Stated Percentage 3.70%  
SPS | Mortgage bonds | Series Due June 15, 2024 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 150 150
Debt Instrument, Interest Rate, Stated Percentage 3.30%  
SPS | Mortgage bonds | Series Due June 15, 2024 2 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 200 200
Debt Instrument, Interest Rate, Stated Percentage 3.30%  
SPS | Mortgage bonds | Series Due Aug. 15, 2041 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 200 200
Debt Instrument, Interest Rate, Stated Percentage 4.50%  
SPS | Mortgage bonds | Series Due Aug. 15, 2041 2 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 100 100
Debt Instrument, Interest Rate, Stated Percentage 4.50%  
SPS | Mortgage bonds | Series Due Aug. 15, 2041 3 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 100 100
Debt Instrument, Interest Rate, Stated Percentage 4.50%  
SPS | Mortgage bonds | Series Due August 15, 2046 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 300 300
Debt Instrument, Interest Rate, Stated Percentage 3.40%  
SPS | Mortgage bonds | Series Due Nov. 15, 2048 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount [11] $ 300 300
Debt Instrument, Interest Rate, Stated Percentage [11] 4.40%  
SPS | Mortgage bonds | Series Due June 15, 2049    
Long-Term Borrowings and Other Financing Instruments    
Face Amount [12] $ 300 0
Debt Instrument, Interest Rate, Stated Percentage [12] 3.75%  
SPS | Unsecured Debt [Member] | Senior C and D Due Oct. 1, 2033 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 100 100
Debt Instrument, Interest Rate, Stated Percentage 6.00%  
SPS | Unsecured Debt [Member] | Senior F Due Oct. 1, 2036 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 250 $ 250
Debt Instrument, Interest Rate, Stated Percentage 6.00%  
[1] 2019 financing
[2]
Xcel Energy adopted ASC 842 on Jan. 1, 2019, which refers to capital leases as finance leases. Under ASC 842, the present value of future finance lease payments is included in other current liabilities and other noncurrent liabilities rather than debt.
[3] Note was redeemed on Dec. 23, 2019.
[4] 2019 financing
[5] 2018 financing
[6] 2018 financing
[7] PSCo adopted ASC 842 on Jan. 1, 2019, which refers to capital leases as finance leases. Under ASC 842, the present value of future finance lease payments is included in other current liabilities and other noncurrent liabilities rather than debt.
[8]
Bond was redeemed on March 29, 2019.
[9]
2018 financing.
[10] 2019 financing
[11] 2018 financing
[12] 2019 financing