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EMPLOYEE BENEFIT PLANS (Fair Value Measurements of Pension Plan Assets) (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets $ 323 $ 289  
Level 3 [Member]
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 21 19 15
Level 3 [Member] | Real Estate
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 14 13 11
Level 3 [Member] | Private Equity
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 7 6 4
Other Retiree Benefits [Member]
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 10 7 5
Fair Value Measurements of Pension Assets [Member] | Cash Equivalents
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 1 1  
Fair Value Measurements of Pension Assets [Member] | United States Large Cap
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 80 71  
Fair Value Measurements of Pension Assets [Member] | United States Small Cap
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 17 15  
Fair Value Measurements of Pension Assets [Member] | Non-United States
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 65 59  
Fair Value Measurements of Pension Assets [Member] | Fixed Income
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 130 116  
Fair Value Measurements of Pension Assets [Member] | Real Estate
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 23 21  
Fair Value Measurements of Pension Assets [Member] | Private Equity
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 7 6  
Fair Value Measurements of Pension Assets [Member] | Level 1 [Member]
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 1 1  
Fair Value Measurements of Pension Assets [Member] | Level 1 [Member] | Cash Equivalents
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 1 1  
Fair Value Measurements of Pension Assets [Member] | Level 1 [Member] | United States Large Cap
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 0 0  
Fair Value Measurements of Pension Assets [Member] | Level 1 [Member] | United States Small Cap
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 0 0  
Fair Value Measurements of Pension Assets [Member] | Level 1 [Member] | Non-United States
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 0 0  
Fair Value Measurements of Pension Assets [Member] | Level 1 [Member] | Fixed Income
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 0 0  
Fair Value Measurements of Pension Assets [Member] | Level 1 [Member] | Real Estate
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 0 0  
Fair Value Measurements of Pension Assets [Member] | Level 1 [Member] | Private Equity
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 0 0  
Fair Value Measurements of Pension Assets [Member] | Level 2 [Member]
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 301 269  
Fair Value Measurements of Pension Assets [Member] | Level 2 [Member] | Cash Equivalents
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 0 0  
Fair Value Measurements of Pension Assets [Member] | Level 2 [Member] | United States Large Cap
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 80 71  
Fair Value Measurements of Pension Assets [Member] | Level 2 [Member] | United States Small Cap
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 17 15  
Fair Value Measurements of Pension Assets [Member] | Level 2 [Member] | Non-United States
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 65 59  
Fair Value Measurements of Pension Assets [Member] | Level 2 [Member] | Fixed Income
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 130 116  
Fair Value Measurements of Pension Assets [Member] | Level 2 [Member] | Real Estate
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 9 8  
Fair Value Measurements of Pension Assets [Member] | Level 2 [Member] | Private Equity
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 0 0  
Fair Value Measurements of Pension Assets [Member] | Level 3 [Member]
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 21 19  
Fair Value Measurements of Pension Assets [Member] | Level 3 [Member] | Cash Equivalents
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 0 0  
Fair Value Measurements of Pension Assets [Member] | Level 3 [Member] | United States Large Cap
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 0 0  
Fair Value Measurements of Pension Assets [Member] | Level 3 [Member] | United States Small Cap
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 0 0  
Fair Value Measurements of Pension Assets [Member] | Level 3 [Member] | Non-United States
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 0 0  
Fair Value Measurements of Pension Assets [Member] | Level 3 [Member] | Fixed Income
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 0 0  
Fair Value Measurements of Pension Assets [Member] | Level 3 [Member] | Real Estate
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 14 13  
Fair Value Measurements of Pension Assets [Member] | Level 3 [Member] | Private Equity
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 7 6  
Uns Gas And Uns Electric [Member]
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 16 14  
Uns Gas And Uns Electric [Member] | Level 2 [Member]
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 16 14  
VEBA Trust [Member] | Other Retiree Benefits [Member]
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 10 7  
VEBA Trust [Member] | Other Retiree Benefits [Member] | Fixed Income
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets 4 3  
VEBA Trust [Member] | Other Retiree Benefits [Member] | VEBA Trust Asset - Equities
      
Pension And Other Employee Benefit Plans [Line Items]      
Fair value measurements of plan assets $ 6 $ 4