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EBP Net Periodic Benefit Cost & OCI (Details 2) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Pension Benefits [Member]      
Components of net periodic benefit cost:      
Service cost $ 54 $ 59 $ 40
Interest cost 62 58 62
Expected return on plan assets (85) (75) (76)
Amortization of prior service cost (credit) 0 0 0
Amortization of net actuarial loss 30 42 39
Net actuarial (gain) loss from settlements and curtailments 2 2 1
Reclassification to regulatory liability 0 0 0
Net periodic benefit cost 63 86 66
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss):      
Net actuarial gain (loss) (23) 5 (142)
Prior service (cost) credit 0 0 0
Amortization of prior service cost (credit) included in net periodic benefit cost 0 0 0
Amortization of net actuarial loss 30 42 39
Loss from settlements and curtailments 2 2 1
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss) 9 49 (102)
Amounts included in accumulated other comprehensive income (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 28    
Other Postretirement Benefits [Member]      
Components of net periodic benefit cost:      
Service cost 1 2 2
Interest cost 8 9 10
Expected return on plan assets (12) (12) (12)
Amortization of prior service cost (credit) (15) (17) (20)
Amortization of net actuarial loss 0 2 0
Net actuarial (gain) loss from settlements and curtailments 0 0 (1)
Reclassification to regulatory liability 4 3 4
Net periodic benefit cost (14) (13) (17)
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss):      
Net actuarial gain (loss) 0 8 (18)
Prior service (cost) credit 0 0 (1)
Amortization of prior service cost (credit) included in net periodic benefit cost (6) (6) (8)
Amortization of net actuarial loss 0 2 0
Loss from settlements and curtailments 0 0 1
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss) (6) 4 (26)
Other changes in plan assets and benefit obligations recognized in regulatory (assets) liabilities:      
Net actuarial gain (loss) recognized in regulatory liabilities (assets) 2 10 (2)
Amortization of prior service cost (credit) from regulatory assets (liabilities) (9) $ (11) $ (12)
Amounts included in accumulated other comprehensive income (loss):      
Prior service cost (credit) expected to be amortized in next fiscal year (5)    
Net actuarial (gain) loss expected to be amortized in next fiscal year 0    
Amounts included in regulatory liabilities associated with Transco and Northwest Pipeline      
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