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Employee Benefit Plans - PacifiCorp - Fair Value Measurements (Details) - USD ($)
$ in Millions
Dec. 31, 2015
May. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Domestic Pension Plans [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets $ 2,489   $ 2,718 $ 2,711  
Domestic Pension Plans [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [1] 1,007   1,302    
Domestic Pension Plans [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [1] 1,370   1,306    
Domestic Pension Plans [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [1] 112   110    
Domestic Pension Plans [Member] | Cash Equivalents [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 31   69    
Domestic Pension Plans [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [1] 0   15    
Domestic Pension Plans [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [1] 31   54    
Domestic Pension Plans [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [1] 0   0    
Domestic Pension Plans [Member] | US Treasury Securities [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 155   166    
Domestic Pension Plans [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [1] 155   166    
Domestic Pension Plans [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [1] 0   0    
Domestic Pension Plans [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [1] 0   0    
Domestic Pension Plans [Member] | Corporate Debt Securities [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 335   268    
Domestic Pension Plans [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [1] 0   0    
Domestic Pension Plans [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [1] 335   268    
Domestic Pension Plans [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [1] 0   0    
Domestic Pension Plans [Member] | Municipal Bonds [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 25   27    
Domestic Pension Plans [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [1] 0   0    
Domestic Pension Plans [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [1] 25   27    
Domestic Pension Plans [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [1] 0   0    
Domestic Pension Plans [Member] | US Government-sponsored Enterprises Debt Securities [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 154   94    
Domestic Pension Plans [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [1] 0   0    
Domestic Pension Plans [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [1] 154   94    
Domestic Pension Plans [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [1] 0   0    
Domestic Pension Plans [Member] | Domestic Equity Securities [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 586   698    
Domestic Pension Plans [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [1] 586   698    
Domestic Pension Plans [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [1] 0   0    
Domestic Pension Plans [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [1] 0   0    
Domestic Pension Plans [Member] | Foreign Equity Securities [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 122   122    
Domestic Pension Plans [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [1] 122   122    
Domestic Pension Plans [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [1] 0   0    
Domestic Pension Plans [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [1] 0   0    
Domestic Pension Plans [Member] | Equity Funds [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [2] $ 965   $ 1,153    
Percentage of Investment Funds Comprised Of Equity Securitites 66.00%   61.00%    
Percentage of Investment Funds Comprised Of Debt Securities 34.00%   39.00%    
Percentage Of Investment Funds Invested in United States Securities 58.00%   64.00%    
Percentage Of Investment Funds Invested In International Securities 42.00%   36.00%    
Domestic Pension Plans [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [1],[2] $ 144   $ 301    
Domestic Pension Plans [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [1],[2] 821   852    
Domestic Pension Plans [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [1],[2] 0   0    
Domestic Pension Plans [Member] | Limited Partnership Interests [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [3] 65   70    
Domestic Pension Plans [Member] | Limited Partnership Interests [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [1],[3] 0   0    
Domestic Pension Plans [Member] | Limited Partnership Interests [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [1],[3] 0   0    
Domestic Pension Plans [Member] | Limited Partnership Interests [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 65 [1],[3]   70 [1],[3] 86 $ 96
Domestic Other Postretirement Plans [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 662   858 852  
Domestic Other Postretirement Plans [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [4] 401   613    
Domestic Other Postretirement Plans [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [4] 257   240    
Domestic Other Postretirement Plans [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [4] 4   5    
Domestic Other Postretirement Plans [Member] | Cash Equivalents [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 14 [5]   146    
Domestic Other Postretirement Plans [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [4] 12 [5]   145    
Domestic Other Postretirement Plans [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [4] 2 [5]   1    
Domestic Other Postretirement Plans [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [4] 0 [5]   0    
Domestic Other Postretirement Plans [Member] | US Treasury Securities [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 18   17    
Domestic Other Postretirement Plans [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [4] 18   17    
Domestic Other Postretirement Plans [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [4] 0   0    
Domestic Other Postretirement Plans [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [4] 0   0    
Domestic Other Postretirement Plans [Member] | Corporate Debt Securities [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 33   34    
Domestic Other Postretirement Plans [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [4] 0   0    
Domestic Other Postretirement Plans [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [4] 33   34    
Domestic Other Postretirement Plans [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [4] 0   0    
Domestic Other Postretirement Plans [Member] | Municipal Bonds [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 41   43    
Domestic Other Postretirement Plans [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [4] 0   0    
Domestic Other Postretirement Plans [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [4] 41   43    
Domestic Other Postretirement Plans [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [4] 0   0    
Domestic Other Postretirement Plans [Member] | US Government-sponsored Enterprises Debt Securities [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 28   31    
Domestic Other Postretirement Plans [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [4] 0   0    
Domestic Other Postretirement Plans [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [4] 28   31    
Domestic Other Postretirement Plans [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [4] 0   0    
Domestic Other Postretirement Plans [Member] | Domestic Equity Securities [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 216   243    
Domestic Other Postretirement Plans [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [4] 216   243    
Domestic Other Postretirement Plans [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [4] 0   0    
Domestic Other Postretirement Plans [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [4] 0   0    
Domestic Other Postretirement Plans [Member] | Foreign Equity Securities [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 6   6    
Domestic Other Postretirement Plans [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [4] 6   6    
Domestic Other Postretirement Plans [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [4] 0   0    
Domestic Other Postretirement Plans [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [4] 0   0    
Domestic Other Postretirement Plans [Member] | Equity Funds [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [6] $ 302   $ 333    
Percentage of Investment Funds Comprised Of Equity Securitites 63.00%   63.00%    
Percentage of Investment Funds Comprised Of Debt Securities 37.00%   37.00%    
Percentage Of Investment Funds Invested in United States Securities 70.00%   69.00%    
Percentage Of Investment Funds Invested In International Securities 30.00%   31.00%    
Domestic Other Postretirement Plans [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [4],[6] $ 149   $ 202    
Domestic Other Postretirement Plans [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [4],[6] 153   131    
Domestic Other Postretirement Plans [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [4],[6] 0   0    
Domestic Other Postretirement Plans [Member] | Limited Partnership Interests [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [7] 4   5    
Domestic Other Postretirement Plans [Member] | Limited Partnership Interests [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [4],[7] 0   0    
Domestic Other Postretirement Plans [Member] | Limited Partnership Interests [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets [4],[7] 0   0    
Domestic Other Postretirement Plans [Member] | Limited Partnership Interests [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 4 [4],[7]   5 [4],[7] 6 7
PacifiCorp [Member] | Domestic Pension Plans [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 1,043   1,146 1,171  
PacifiCorp [Member] | Domestic Pension Plans [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 527   736    
PacifiCorp [Member] | Domestic Pension Plans [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 451   340    
PacifiCorp [Member] | Domestic Pension Plans [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 65   70    
PacifiCorp [Member] | Domestic Pension Plans [Member] | Cash Equivalents [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 10   8    
PacifiCorp [Member] | Domestic Pension Plans [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 0   0    
PacifiCorp [Member] | Domestic Pension Plans [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 10   8    
PacifiCorp [Member] | Domestic Pension Plans [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 0   0    
PacifiCorp [Member] | Domestic Pension Plans [Member] | US Treasury Securities [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 19   15    
PacifiCorp [Member] | Domestic Pension Plans [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 19   15    
PacifiCorp [Member] | Domestic Pension Plans [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 0   0    
PacifiCorp [Member] | Domestic Pension Plans [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 0   0    
PacifiCorp [Member] | Domestic Pension Plans [Member] | Corporate Debt Securities [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 42   53    
PacifiCorp [Member] | Domestic Pension Plans [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 0   0    
PacifiCorp [Member] | Domestic Pension Plans [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 42   53    
PacifiCorp [Member] | Domestic Pension Plans [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 0   0    
PacifiCorp [Member] | Domestic Pension Plans [Member] | Municipal Bonds [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 5   8    
PacifiCorp [Member] | Domestic Pension Plans [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 0   0    
PacifiCorp [Member] | Domestic Pension Plans [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 5   8    
PacifiCorp [Member] | Domestic Pension Plans [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 0   0    
PacifiCorp [Member] | Domestic Pension Plans [Member] | US Government-sponsored Enterprises Debt Securities [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 43   48    
PacifiCorp [Member] | Domestic Pension Plans [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 0   0    
PacifiCorp [Member] | Domestic Pension Plans [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 43   48    
PacifiCorp [Member] | Domestic Pension Plans [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 0   0    
PacifiCorp [Member] | Domestic Pension Plans [Member] | Domestic Equity Securities [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 408   488    
PacifiCorp [Member] | Domestic Pension Plans [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 408   488    
PacifiCorp [Member] | Domestic Pension Plans [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 0   0    
PacifiCorp [Member] | Domestic Pension Plans [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 0   0    
PacifiCorp [Member] | Domestic Pension Plans [Member] | Foreign Equity Securities [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 17   16    
PacifiCorp [Member] | Domestic Pension Plans [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 17   16    
PacifiCorp [Member] | Domestic Pension Plans [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 0   0    
PacifiCorp [Member] | Domestic Pension Plans [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 0   0    
PacifiCorp [Member] | Domestic Pension Plans [Member] | Equity Funds [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets $ 434   $ 440    
Percentage of Investment Funds Comprised Of Equity Securitites 53.00%   50.00%    
Percentage of Investment Funds Comprised Of Debt Securities 47.00%   50.00%    
Percentage Of Investment Funds Invested in United States Securities 40.00%   43.00%    
Percentage Of Investment Funds Invested In International Securities 60.00%   57.00%    
PacifiCorp [Member] | Domestic Pension Plans [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets $ 83   $ 217    
PacifiCorp [Member] | Domestic Pension Plans [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 351   223    
PacifiCorp [Member] | Domestic Pension Plans [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 0   0    
PacifiCorp [Member] | Domestic Pension Plans [Member] | Limited Partnership Interests [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 65   70    
PacifiCorp [Member] | Domestic Pension Plans [Member] | Limited Partnership Interests [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 0   0    
PacifiCorp [Member] | Domestic Pension Plans [Member] | Limited Partnership Interests [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 0   0    
PacifiCorp [Member] | Domestic Pension Plans [Member] | Limited Partnership Interests [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 65   70 86 96
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 305   482 486  
Defined Benefit Plan, Amount To Be Transferred 150 $ 150      
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 144   347    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 157   130    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 4   5    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Cash Equivalents [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 5   139    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 4   139    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 1   0    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 0   0    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | US Treasury Securities [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 9   8    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 9   8    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 0   0    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 0   0    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Corporate Debt Securities [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 15   18    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 0   0    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 15   18    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 0   0    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Municipal Bonds [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 1   2    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 0   0    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 1   2    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 0   0    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | US Government-sponsored Enterprises Debt Securities [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 14   16    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 0   0    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 14   16    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 0   0    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Domestic Equity Securities [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 95   112    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 95   112    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 0   0    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 0   0    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Foreign Equity Securities [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 4   4    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 4   4    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 0   0    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 0   0    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Equity Funds [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets $ 158   $ 178    
Percentage of Investment Funds Comprised Of Equity Securitites 61.00%   63.00%    
Percentage of Investment Funds Comprised Of Debt Securities 39.00%   37.00%    
Percentage Of Investment Funds Invested in United States Securities 67.00%   64.00%    
Percentage Of Investment Funds Invested In International Securities 33.00%   36.00%    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets $ 32   $ 84    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 126   94    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 0   0    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Limited Partnership Interests [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 4   5    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Limited Partnership Interests [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 0   0    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Limited Partnership Interests [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets 0   0    
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Limited Partnership Interests [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets $ 4   $ 5 $ 6 $ 7
[1] Refer to Note 15 for additional discussion regarding the three levels of the fair value hierarchy.
[2] Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 66% and 34%, respectively, for 2015 and 61% and 39%, respectively, for 2014. Additionally, these funds are invested in United States and international securities of approximately 58% and 42%, respectively, for 2015 and 64% and 36%, respectively, for 2014.
[3] Limited partnership interests include several funds that invest primarily in real estate, buyout, growth equity and venture capital.
[4] Refer to Note 15 for additional discussion regarding the three levels of the fair value hierarchy.
[5] In December 2014, PacifiCorp began to migrate funds to cash and cash equivalents in anticipation of the $150 million to be transferred to a fund managed by the UMWA in May 2015 as a result of the other postretirement settlement. Remaining investments were rebalanced to align to PacifiCorp's target investment allocations.
[6] Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 63% and 37%, respectively, for 2015 and 63% and 37%, respectively, for 2014. Additionally, these funds are invested in United States and international securities of approximately 70% and 30%, respectively, for 2015 and 69% and 31%, respectively, for 2014.
[7] Limited partnership interests include several funds that invest primarily in real estate, buyout, growth equity and venture capital.