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Commitments and Guarantees Unrecorded Unconditional Purchase Obligations (Details)
$ in Millions
Dec. 31, 2015
USD ($)
Capital Additions [Member]  
Unrecorded Unconditional Purchase Obligation [Line Items]  
Unrecorded Unconditional Purchase Obligation $ 127
Unrecorded Unconditional Purchase Obligation, Due within One Year 85
Unrecorded Unconditional Purchase Obligation, Due within Two Years 2
Unrecorded Unconditional Purchase Obligation, Due within Three Years 2
Unrecorded Unconditional Purchase Obligation, Due within Four Years 2
Unrecorded Unconditional Purchase Obligation, Due within Five Years 9
Unrecorded Unconditional Purchase Obligation, Due after Five Years 27
Long-term Contract for Purchase of Electric Power [Domain]  
Unrecorded Unconditional Purchase Obligation [Line Items]  
Unrecorded Unconditional Purchase Obligation 1,769
Unrecorded Unconditional Purchase Obligation, Due within One Year 226
Unrecorded Unconditional Purchase Obligation, Due within Two Years 204
Unrecorded Unconditional Purchase Obligation, Due within Three Years 147
Unrecorded Unconditional Purchase Obligation, Due within Four Years 150
Unrecorded Unconditional Purchase Obligation, Due within Five Years 190
Unrecorded Unconditional Purchase Obligation, Due after Five Years 852
Electric Transmission [Member]  
Unrecorded Unconditional Purchase Obligation [Line Items]  
Unrecorded Unconditional Purchase Obligation 63
Unrecorded Unconditional Purchase Obligation, Due within One Year 26
Unrecorded Unconditional Purchase Obligation, Due within Two Years 6
Unrecorded Unconditional Purchase Obligation, Due within Three Years 6
Unrecorded Unconditional Purchase Obligation, Due within Four Years 5
Unrecorded Unconditional Purchase Obligation, Due within Five Years 4
Unrecorded Unconditional Purchase Obligation, Due after Five Years 16
Public Utility Districts [Member]  
Unrecorded Unconditional Purchase Obligation [Line Items]  
Unrecorded Unconditional Purchase Obligation 30
Unrecorded Unconditional Purchase Obligation, Due within One Year 6
Unrecorded Unconditional Purchase Obligation, Due within Two Years 5
Unrecorded Unconditional Purchase Obligation, Due within Three Years 5
Unrecorded Unconditional Purchase Obligation, Due within Four Years 1
Unrecorded Unconditional Purchase Obligation, Due within Five Years 1
Unrecorded Unconditional Purchase Obligation, Due after Five Years 12
Natural gas [Member]  
Unrecorded Unconditional Purchase Obligation [Line Items]  
Unrecorded Unconditional Purchase Obligation 436
Unrecorded Unconditional Purchase Obligation, Due within One Year 67
Unrecorded Unconditional Purchase Obligation, Due within Two Years 41
Unrecorded Unconditional Purchase Obligation, Due within Three Years 38
Unrecorded Unconditional Purchase Obligation, Due within Four Years 37
Unrecorded Unconditional Purchase Obligation, Due within Five Years 32
Unrecorded Unconditional Purchase Obligation, Due after Five Years 221
Coal and transportationSupply Agreements [Member]  
Unrecorded Unconditional Purchase Obligation [Line Items]  
Unrecorded Unconditional Purchase Obligation 35
Unrecorded Unconditional Purchase Obligation, Due within One Year 14
Unrecorded Unconditional Purchase Obligation, Due within Two Years 11
Unrecorded Unconditional Purchase Obligation, Due within Three Years 5
Unrecorded Unconditional Purchase Obligation, Due within Four Years 5
Unrecorded Unconditional Purchase Obligation, Due within Five Years 0
Unrecorded Unconditional Purchase Obligation, Due after Five Years 0
Operatomg leases [Member]  
Unrecorded Unconditional Purchase Obligation [Line Items]  
Unrecorded Unconditional Purchase Obligation 222
Unrecorded Unconditional Purchase Obligation, Due within One Year 10
Unrecorded Unconditional Purchase Obligation, Due within Two Years 10
Unrecorded Unconditional Purchase Obligation, Due within Three Years 9
Unrecorded Unconditional Purchase Obligation, Due within Four Years 7
Unrecorded Unconditional Purchase Obligation, Due within Five Years 6
Unrecorded Unconditional Purchase Obligation, Due after Five Years 180
Commitments [Member]  
Unrecorded Unconditional Purchase Obligation [Line Items]  
Unrecorded Unconditional Purchase Obligation 2,682
Unrecorded Unconditional Purchase Obligation, Due within One Year 434
Unrecorded Unconditional Purchase Obligation, Due within Two Years 279
Unrecorded Unconditional Purchase Obligation, Due within Three Years 212
Unrecorded Unconditional Purchase Obligation, Due within Four Years 207
Unrecorded Unconditional Purchase Obligation, Due within Five Years 242
Unrecorded Unconditional Purchase Obligation, Due after Five Years $ 1,308