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Fair Value of Financial Assets and Liabilities, Derivative Assets and Liabilities at Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Collateral, Obligation to Return Cash, Offset |  | $ 32 |  | $ 0
Derivative Liability, Collateral, Right to Reclaim Cash, Offset |  | 15 |  | 3
Other Current Assets |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 87 |  | 44
Other Current Liabilities |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 61 |  | 29
Other Noncurrent Assets |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 34 |  | 48
Other Noncurrent Liabilities |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 129 |  | 126
Fair Value Measured on a Recurring Basis | Other Current Assets |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 83 |  | 39
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset | [1] | (44) |  | (17)
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Commodity Trading |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 54 |  | 9
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset | [1] | (44) |  | (15)
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Electric Commodity |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 25 |  | 30
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset | [1] | 0 |  | (2)
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Natural Gas Commodity |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 4 |  | 0
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset | [1] | 0 |  | 0
Fair Value Measured on a Recurring Basis | Other Current Liabilities |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 41 |  | 6
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset | [2] | (60) |  | (17)
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Designated as Hedging Instrument | Interest Rate Swap |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset | [2] | 0 |  | 0
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Commodity Trading |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 34 |  | 5
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset | [2] | (60) |  | (15)
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Electric Commodity |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 0 |  | 0
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset | [2] | 0 |  | (2)
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Natural Gas Commodity |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 0 |  | 1
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset | [2] | 0 |  | 0
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 18 |  | 29
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset | [1] | (14) |  | (7)
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Other Derivative Instruments | Commodity Trading |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 18 |  | 29
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset | [1] | (14) |  | (7)
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 36 |  | 14
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset | [2] | 17 |  | (10)
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Other Derivative Instruments | Commodity Trading |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 36 |  | 14
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset |  | 17 | [2] | (10)
Fair Value Measured on a Recurring Basis | Level 1 | Other Current Assets |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 4 |  | 2
Fair Value Measured on a Recurring Basis | Level 1 | Other Current Assets | Other Derivative Instruments | Commodity Trading |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 4 |  | 2
Fair Value Measured on a Recurring Basis | Level 1 | Other Current Assets | Other Derivative Instruments | Electric Commodity |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 0 |  | 0
Fair Value Measured on a Recurring Basis | Level 1 | Other Current Assets | Other Derivative Instruments | Natural Gas Commodity |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 0 |  | 0
Fair Value Measured on a Recurring Basis | Level 1 | Other Current Liabilities |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 4 |  | 2
Fair Value Measured on a Recurring Basis | Level 1 | Other Current Liabilities | Other Derivative Instruments | Commodity Trading |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 4 |  | 2
Fair Value Measured on a Recurring Basis | Level 1 | Other Current Liabilities | Other Derivative Instruments | Electric Commodity |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 0 |  | 0
Fair Value Measured on a Recurring Basis | Level 1 | Other Current Liabilities | Other Derivative Instruments | Natural Gas Commodity |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 0 |  | 0
Fair Value Measured on a Recurring Basis | Level 1 | Other Noncurrent Assets |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 0 |  | 0
Fair Value Measured on a Recurring Basis | Level 1 | Other Noncurrent Assets | Other Derivative Instruments | Commodity Trading |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 0 |  | 0
Fair Value Measured on a Recurring Basis | Level 1 | Other Noncurrent Liabilities |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 0 |  | 0
Fair Value Measured on a Recurring Basis | Level 1 | Other Noncurrent Liabilities | Other Derivative Instruments | Commodity Trading |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 0 |  | 0
Fair Value Measured on a Recurring Basis | Level 2 | Other Current Assets |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 96 |  | 22
Fair Value Measured on a Recurring Basis | Level 2 | Other Current Assets | Other Derivative Instruments | Commodity Trading |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 92 |  | 22
Fair Value Measured on a Recurring Basis | Level 2 | Other Current Assets | Other Derivative Instruments | Electric Commodity |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 0 |  | 0
Fair Value Measured on a Recurring Basis | Level 2 | Other Current Assets | Other Derivative Instruments | Natural Gas Commodity |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 4 |  | 0
Fair Value Measured on a Recurring Basis | Level 2 | Other Current Liabilities |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 95 |  | 19
Fair Value Measured on a Recurring Basis | Level 2 | Other Current Liabilities | Other Derivative Instruments | Commodity Trading |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 88 |  | 18
Fair Value Measured on a Recurring Basis | Level 2 | Other Current Liabilities | Other Derivative Instruments | Electric Commodity |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 0 |  | 0
Fair Value Measured on a Recurring Basis | Level 2 | Other Current Liabilities | Other Derivative Instruments | Natural Gas Commodity |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 0 |  | 1
Fair Value Measured on a Recurring Basis | Level 2 | Other Noncurrent Assets |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 27 |  | 31
Fair Value Measured on a Recurring Basis | Level 2 | Other Noncurrent Assets | Other Derivative Instruments | Commodity Trading |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 27 |  | 31
Fair Value Measured on a Recurring Basis | Level 2 | Other Noncurrent Liabilities |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 18 |  | 24
Fair Value Measured on a Recurring Basis | Level 2 | Other Noncurrent Liabilities | Other Derivative Instruments | Commodity Trading |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 18 |  | 24
Fair Value Measured on a Recurring Basis | Level 3 | Other Current Assets |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 27 |  | 32
Fair Value Measured on a Recurring Basis | Level 3 | Other Current Assets | Other Derivative Instruments | Commodity Trading |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 2 |  | 0
Fair Value Measured on a Recurring Basis | Level 3 | Other Current Assets | Other Derivative Instruments | Electric Commodity |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 25 |  | 32
Fair Value Measured on a Recurring Basis | Level 3 | Other Current Assets | Other Derivative Instruments | Natural Gas Commodity |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 0 |  | 0
Fair Value Measured on a Recurring Basis | Level 3 | Other Current Liabilities |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 2 |  | 2
Fair Value Measured on a Recurring Basis | Level 3 | Other Current Liabilities | Other Derivative Instruments | Commodity Trading |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 2 |  | 0
Fair Value Measured on a Recurring Basis | Level 3 | Other Current Liabilities | Other Derivative Instruments | Electric Commodity |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 0 |  | 2
Fair Value Measured on a Recurring Basis | Level 3 | Other Current Liabilities | Other Derivative Instruments | Natural Gas Commodity |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 0 |  | 0
Fair Value Measured on a Recurring Basis | Level 3 | Other Noncurrent Assets |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 5 |  | 5
Fair Value Measured on a Recurring Basis | Level 3 | Other Noncurrent Assets | Other Derivative Instruments | Commodity Trading |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 5 |  | 5
Fair Value Measured on a Recurring Basis | Level 3 | Other Noncurrent Liabilities |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 1 |  | 0
Fair Value Measured on a Recurring Basis | Level 3 | Other Noncurrent Liabilities | Other Derivative Instruments | Commodity Trading |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 1 |  | 0
Fair Value, Measurements, Nonrecurring | Other Current Assets | Purchased Power Agreements |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset | [2] | 4 |  | 5
Fair Value, Measurements, Nonrecurring | Other Current Liabilities | Purchased Power Agreements |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability | [1] | 20 |  | 23
Fair Value, Measurements, Nonrecurring | Other Noncurrent Assets | Purchased Power Agreements |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset | [2] | 16 |  | 19
Fair Value, Measurements, Nonrecurring | Other Noncurrent Liabilities | Purchased Power Agreements |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability | [1] | 93 |  | 112
Fair Value | Fair Value Measured on a Recurring Basis | Other Current Assets |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 127 |  | 56
Fair Value | Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Commodity Trading |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 98 |  | 24
Fair Value | Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Electric Commodity |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 25 |  | 32
Fair Value | Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Natural Gas Commodity |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 4 |  | 0
Fair Value | Fair Value Measured on a Recurring Basis | Other Current Liabilities |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 101 |  | 23
Fair Value | Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Commodity Trading |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 94 |  | 20
Fair Value | Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Electric Commodity |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 0 |  | 2
Fair Value | Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Natural Gas Commodity |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 0 |  | 1
Fair Value | Fair Value Measured on a Recurring Basis | Other Noncurrent Assets |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 32 |  | 36
Fair Value | Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Other Derivative Instruments | Commodity Trading |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 32 |  | 36
Fair Value | Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 19 |  | 24
Fair Value | Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Other Derivative Instruments | Commodity Trading |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 19 |  | 24
Cash Flow Hedges | Fair Value Measured on a Recurring Basis | Other Current Liabilities | Designated as Hedging Instrument | Interest Rate Swap |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 7 |  | 0
Cash Flow Hedges | Fair Value Measured on a Recurring Basis | Level 1 | Other Current Liabilities | Designated as Hedging Instrument | Interest Rate Swap |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 0 |  | 0
Cash Flow Hedges | Fair Value Measured on a Recurring Basis | Level 2 | Other Current Liabilities | Designated as Hedging Instrument | Interest Rate Swap |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 7 |  | 0
Cash Flow Hedges | Fair Value Measured on a Recurring Basis | Level 3 | Other Current Liabilities | Designated as Hedging Instrument | Interest Rate Swap |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 0 |  | 0
Cash Flow Hedges | Fair Value | Fair Value Measured on a Recurring Basis | Other Current Liabilities | Designated as Hedging Instrument | Interest Rate Swap |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | $ 7 |  | $ 0
[1] | During 2006, Xcel Energy qualified these contracts under the normal purchase exception. Based on this qualification, the contracts are no longer adjusted to fair value and the previous carrying value of these contracts will be amortized over the remaining contract lives along with the offsetting regulatory assets and liabilities.
[2] | Xcel Energy nets derivative instruments and related collateral in its consolidated balance sheet when supported by a legally enforceable master netting agreement, and all derivative instruments and related collateral amounts were subject to master netting agreements as of Dec. 31, 2018 and 2017. At Dec. 31, 2018 and 2017, derivative assets and liabilities include $32 million and $0 million of obligations to return cash collateral, respectively. At Dec. 31, 2018 and 2017, derivative assets and liabilities include rights to reclaim cash collateral of $15 million and $3 million, respectively. Counterparty netting excludes settlement receivables and payables and non-derivative amounts that may be subject to the same master netting agreements.

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