XML 19 R50.htm IDEA: XBRL DOCUMENT v2.4.1.9
Segment Information (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Segment Reporting Information [Line Items]    
Operating revenues $ 1,135,450,000us-gaap_Revenues $ 1,203,543,000us-gaap_Revenues
Net income (loss) 110,966,000us-gaap_NetIncomeLoss 118,403,000us-gaap_NetIncomeLoss
Affiliate electric revenue 2,000,000psco_RelatedPartyTransactionElectricDomesticRegulatedRevenue 2,000,000psco_RelatedPartyTransactionElectricDomesticRegulatedRevenue
Affiliate other revenue 1,000,000psco_RelatedPartyTransactionOtherRevenueNet 1,000,000psco_RelatedPartyTransactionOtherRevenueNet
Regulated Electric    
Segment Reporting Information [Line Items]    
Operating revenues 749,549,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= psco_RegulatedElectricMember		 734,361,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= psco_RegulatedElectricMember
Net income (loss) 74,669,000us-gaap_NetIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= psco_RegulatedElectricMember		 73,968,000us-gaap_NetIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= psco_RegulatedElectricMember
Regulated Natural Gas    
Segment Reporting Information [Line Items]    
Operating revenues 373,244,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= psco_RegulatedNaturalGasMember		 456,396,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= psco_RegulatedNaturalGasMember
Net income (loss) 36,623,000us-gaap_NetIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= psco_RegulatedNaturalGasMember		 38,149,000us-gaap_NetIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= psco_RegulatedNaturalGasMember
All Other    
Segment Reporting Information [Line Items]    
Operating revenues 12,786,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 12,942,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
Net income (loss) (326,000)us-gaap_NetIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 6,286,000us-gaap_NetIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
Operating Segments    
Segment Reporting Information [Line Items]    
Operating revenues 1,135,450,000us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember		 [1],[2] 1,203,543,000us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember		 [1],[2]
Operating Segments | Regulated Electric    
Segment Reporting Information [Line Items]    
Operating revenues 749,461,000us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= psco_RegulatedElectricMember		 [2] 734,264,000us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= psco_RegulatedElectricMember		 [2]
Operating Segments | Regulated Natural Gas    
Segment Reporting Information [Line Items]    
Operating revenues 373,203,000us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= psco_RegulatedNaturalGasMember		 456,337,000us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= psco_RegulatedNaturalGasMember
Operating Segments | All Other    
Segment Reporting Information [Line Items]    
Operating revenues 12,786,000us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 [1] 12,942,000us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 [1]
Intersegment Eliminations    
Segment Reporting Information [Line Items]    
Operating revenues (129,000)us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember		 (156,000)us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
Intersegment Eliminations | Regulated Electric    
Segment Reporting Information [Line Items]    
Operating revenues 88,000us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_StatementBusinessSegmentsAxis
= psco_RegulatedElectricMember		 97,000us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_StatementBusinessSegmentsAxis
= psco_RegulatedElectricMember
Intersegment Eliminations | Regulated Natural Gas    
Segment Reporting Information [Line Items]    
Operating revenues 41,000us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_StatementBusinessSegmentsAxis
= psco_RegulatedNaturalGasMember		 59,000us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_StatementBusinessSegmentsAxis
= psco_RegulatedNaturalGasMember
Intersegment Eliminations | All Other    
Segment Reporting Information [Line Items]    
Operating revenues $ 0us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 $ 0us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
[1] Operating revenues include $1 million of other affiliate revenue for the three months ended March 31, 2015 and 2014.
[2] Operating revenues include $2 million of affiliate electric revenue for the three months ended March 31, 2015 and 2014.