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Employee Benefit Plans (Target Asset Allocation Percentages) (Details)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Other Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, target allocation percentage of assets, Total 100.00%pcg_DefinedBenefitPlanTargetAllocationPercentageOfAssetsTotal
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Pension Plans Defined Benefit [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, target allocation percentage of assets, Total 100.00%pcg_DefinedBenefitPlanTargetAllocationPercentageOfAssetsTotal
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Fixed Income Securities[Member] | Other Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Target Allocation Percentage of Assets, Other 58.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
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Fixed Income Securities[Member] | Pension Plans Defined Benefit [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Target Allocation Percentage of Assets, Other 60.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
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= us-gaap_FixedIncomeFundsMember
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= us-gaap_PensionPlansDefinedBenefitMember
Real Assets [member] | Other Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Target Allocation Percentage of Assets, Other 8.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
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= pcg_RealAssetsMember
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= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember		 8.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
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= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Real Assets [member] | Pension Plans Defined Benefit [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Target Allocation Percentage of Assets, Other 10.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
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= pcg_RealAssetsMember
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/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
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Absolute Return [Member] | Other Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Target Allocation Percentage of Assets, Other 3.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
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Absolute Return [Member] | Pension Plans Defined Benefit [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Target Allocation Percentage of Assets, Other 5.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
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Global Equity Securities [Member] | Other Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Target Allocation Percentage of Assets, Other 31.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
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/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Global Equity Securities [Member] | Pension Plans Defined Benefit [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Target Allocation Percentage of Assets, Other 25.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
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