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EBP Net Periodic Benefit Cost & OCI (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Pension Benefits [Member]
     
Components of net periodic benefit cost:      
Service cost $ 44 $ 39 $ 41
Interest cost 51 55 64
Expected return on plan assets (61) (64) (77)
Amortization of prior service cost (credit) 1 1 1
Amortization of net actuarial loss 60 53 38
Net actuarial loss from settlements 0 5 4
Reclassification to regulatory liability 0 0 0
Net periodic benefit cost 95 89 71
Amounts related to WPX's net periodic benefit cost recorded in income (loss) from discontinued operations     8
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss):      
Net actuarial gain (loss) 277 (51) (220)
Prior service credit 0 0 0
Amortization of prior service cost (credit) 1 1 1
Amortization of net actuarial loss and loss from settlements 60 58 42
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss) 338 8 (177)
Amounts included in accumulated other comprehensive loss:      
Prior service cost (credit) expected to be amortized in next fiscal year 0    
Net actuarial (gain) loss expected to be amortized in next fiscal year 38    
Other Postretirement Benefits [Member]
     
Components of net periodic benefit cost:      
Service cost 2 3 2
Interest cost 11 13 15
Expected return on plan assets (9) (9) (10)
Amortization of prior service cost (credit) (12) (7) (11)
Amortization of net actuarial loss 4 8 3
Net actuarial loss from settlements 0 0 0
Reclassification to regulatory liability 2 0 1
Net periodic benefit cost (2) 8 0
Amounts related to WPX's net periodic benefit cost recorded in income (loss) from discontinued operations     1
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss):      
Net actuarial gain (loss) 23 2 (21)
Prior service credit 23 2 2
Amortization of prior service cost (credit) (4) (3) (4)
Amortization of net actuarial loss and loss from settlements 1 3 1
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss) 43 4 (22)
Other changes in plan assets and benefit obligations recognized in regulatory (assets) liabilities:      
Net actuarial gain (loss) recognized in regulatory liabilities (assets) 62 13 (39)
Prior service credit (cost) recognized in regulatory liabilities (assets) 36 4 1
Amortization of net actuarial loss (gain) from regulatory assets (liabilities) 3 5 2
Amortization of prior service cost (credit) from regulatory assets (liabilities) (8) (4) (7)
Amounts included in accumulated other comprehensive loss:      
Prior service cost (credit) expected to be amortized in next fiscal year (8)    
Net actuarial (gain) loss expected to be amortized in next fiscal year 0    
Amounts included in regulatory assets or liabilities associated with Transco and Northwest Pipeline      
Prior service cost (credit) expected to be amortized in next fiscal year (12)    
Net actuarial (gain) loss expected to be amortized in next fiscal year $ 0