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Commitments and Contingencies - Environmental Matters and Financial Assurances (Details)
$ in Millions
6 Months Ended
May. 23, 2013
USD ($)
Jun. 30, 2015
USD ($)
Letter_of_credit
Four Corners | New Mexico Tax Matter    
Environmental Matters    
Coal severance surtax, penalty, and interest $ 30  
Arizona Public Service Company | Letters of Credit Expiring in 2016    
Financial Assurances    
Number of letters of credit expiring | Letter_of_credit   2
Arizona Public Service Company | Letters of Credit Expiring in 2017    
Financial Assurances    
Number of letters of credit expiring | Letter_of_credit   1
Arizona Public Service Company | Letter of Credit    
Financial Assurances    
Outstanding letters of credit   $ 76
Arizona Public Service Company | Equity Lessors in Palo Verde sale leaseback transactions    
Financial Assurances    
Outstanding letters of credit   20
Arizona Public Service Company | Natural gas tolling contract obligations    
Financial Assurances    
Outstanding letters of credit   $ 35
Arizona Public Service Company | Four Corners | New Mexico Tax Matter    
Environmental Matters    
Share of the assessment $ 12  
Regional Haze Rules | Arizona Public Service Company | Four Corners Units 4 and 5    
Environmental Matters    
Percentage of share of cost of control   63.00%
Expected environmental cost   $ 400
Regional Haze Rules | Arizona Public Service Company | Natural gas tolling contract obligations | Four Corners Units 4 and 5    
Environmental Matters    
Additional percentage share of cost of control   7.00%
Regional Haze Rules | Arizona Public Service Company | Four Corners | Four Corners Units 4 and 5    
Environmental Matters    
Site contingency increase in loss exposure not accrued, best estimate   $ 45
Regional Haze Rules | Arizona Public Service Company | Navajo Plant    
Environmental Matters    
Expected environmental cost   200
Regional Haze Rules | Arizona Public Service Company | Cholla    
Environmental Matters    
Expected environmental cost   200
Mercury and air toxic standards (MATS) | Arizona Public Service Company | Navajo Plant    
Environmental Matters    
Expected environmental cost   1
Mercury and air toxic standards (MATS) | Arizona Public Service Company | Cholla Units 2 And 3    
Environmental Matters    
Expected environmental cost   130
Coal combustion waste | Arizona Public Service Company | Four Corners    
Environmental Matters    
Site contingency increase in loss exposure not accrued, best estimate   15
Coal combustion waste | Arizona Public Service Company | Navajo Plant    
Environmental Matters    
Site contingency increase in loss exposure not accrued, best estimate   1
Coal combustion waste | Arizona Public Service Company | Cholla    
Environmental Matters    
Site contingency increase in loss exposure not accrued, best estimate   $ 85