Commitments and Guarantees Unrecorded Unconditional Purchase Obligations (Details) $ in Millions	Dec. 31, 2023 USD ($)
Capital Addition Purchase Commitments [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded Unconditional Purchase Obligation	$ 1,027
Unrecorded Unconditional Purchase Obligation, Due within One Year	694
Unrecorded Unconditional Purchase Obligation, Due within Two Years	272
Unrecorded Unconditional Purchase Obligation, Due within Three Years	13
Unrecorded Unconditional Purchase Obligation, Due within Four Years	5
Unrecorded Unconditional Purchase Obligation, Due within Five Years	2
Unrecorded Unconditional Purchase Obligation, Due after Five Years	41
Long-term Contract for Purchase of Electric Power [Domain]
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded Unconditional Purchase Obligation	5,098
Unrecorded Unconditional Purchase Obligation, Due within One Year	727
Unrecorded Unconditional Purchase Obligation, Due within Two Years	692
Unrecorded Unconditional Purchase Obligation, Due within Three Years	333
Unrecorded Unconditional Purchase Obligation, Due within Four Years	294
Unrecorded Unconditional Purchase Obligation, Due within Five Years	286
Unrecorded Unconditional Purchase Obligation, Due after Five Years	2,766
Electric Transmission [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded Unconditional Purchase Obligation	411
Unrecorded Unconditional Purchase Obligation, Due within One Year	119
Unrecorded Unconditional Purchase Obligation, Due within Two Years	122
Unrecorded Unconditional Purchase Obligation, Due within Three Years	96
Unrecorded Unconditional Purchase Obligation, Due within Four Years	5
Unrecorded Unconditional Purchase Obligation, Due within Five Years	5
Unrecorded Unconditional Purchase Obligation, Due after Five Years	64
Public Utility Districts [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded Unconditional Purchase Obligation	65
Unrecorded Unconditional Purchase Obligation, Due within One Year	12
Unrecorded Unconditional Purchase Obligation, Due within Two Years	11
Unrecorded Unconditional Purchase Obligation, Due within Three Years	10
Unrecorded Unconditional Purchase Obligation, Due within Four Years	9
Unrecorded Unconditional Purchase Obligation, Due within Five Years	7
Unrecorded Unconditional Purchase Obligation, Due after Five Years	16
Natural gas [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded Unconditional Purchase Obligation	471
Unrecorded Unconditional Purchase Obligation, Due within One Year	104
Unrecorded Unconditional Purchase Obligation, Due within Two Years	69
Unrecorded Unconditional Purchase Obligation, Due within Three Years	37
Unrecorded Unconditional Purchase Obligation, Due within Four Years	37
Unrecorded Unconditional Purchase Obligation, Due within Five Years	37
Unrecorded Unconditional Purchase Obligation, Due after Five Years	187
Coal and transportationSupply Agreements [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded Unconditional Purchase Obligation	54
Unrecorded Unconditional Purchase Obligation, Due within One Year	27
Unrecorded Unconditional Purchase Obligation, Due within Two Years	27
Unrecorded Unconditional Purchase Obligation, Due within Three Years	0
Unrecorded Unconditional Purchase Obligation, Due within Four Years	0
Unrecorded Unconditional Purchase Obligation, Due within Five Years	0
Unrecorded Unconditional Purchase Obligation, Due after Five Years	0
Commitments [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded Unconditional Purchase Obligation	7,126
Unrecorded Unconditional Purchase Obligation, Due within One Year	1,683
Unrecorded Unconditional Purchase Obligation, Due within Two Years	1,193
Unrecorded Unconditional Purchase Obligation, Due within Three Years	489
Unrecorded Unconditional Purchase Obligation, Due within Four Years	350
Unrecorded Unconditional Purchase Obligation, Due within Five Years	337
Unrecorded Unconditional Purchase Obligation, Due after Five Years	$ 3,074