Commitments and Guarantees Unrecorded Unconditional Purchase Obligations (Details) $ in Millions	Dec. 31, 2022 USD ($)
Capital Addition Purchase Commitments [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded Unconditional Purchase Obligation	$ 395
Unrecorded Unconditional Purchase Obligation, Due within One Year	239
Unrecorded Unconditional Purchase Obligation, Due within Two Years	70
Unrecorded Unconditional Purchase Obligation, Due within Three Years	36
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	43
Long-term Contract for Purchase of Electric Power [Domain]
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded Unconditional Purchase Obligation	5,599
Unrecorded Unconditional Purchase Obligation, Due within One Year	457
Unrecorded Unconditional Purchase Obligation, Due within Two Years	449
Unrecorded Unconditional Purchase Obligation, Due within Three Years	428
Unrecorded Unconditional Purchase Obligation, Due within Four Years	303
Unrecorded Unconditional Purchase Obligation, Due within Five Years	309
Unrecorded Unconditional Purchase Obligation, Due after Five Years	3,653
Electric Transmission [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded Unconditional Purchase Obligation	133
Unrecorded Unconditional Purchase Obligation, Due within One Year	17
Unrecorded Unconditional Purchase Obligation, Due within Two Years	17
Unrecorded Unconditional Purchase Obligation, Due within Three Years	20
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	69
Public Utility Districts [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded Unconditional Purchase Obligation	77
Unrecorded Unconditional Purchase Obligation, Due within One Year	12
Unrecorded Unconditional Purchase Obligation, Due within Two Years	12
Unrecorded Unconditional Purchase Obligation, Due within Three Years	11
Unrecorded Unconditional Purchase Obligation, Due within Four Years	10
Unrecorded Unconditional Purchase Obligation, Due within Five Years	9
Unrecorded Unconditional Purchase Obligation, Due after Five Years	23
Natural gas [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded Unconditional Purchase Obligation	508
Unrecorded Unconditional Purchase Obligation, Due within One Year	158
Unrecorded Unconditional Purchase Obligation, Due within Two Years	43
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	30
Unrecorded Unconditional Purchase Obligation, Due after Five Years	202
Coal and transportationSupply Agreements [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded Unconditional Purchase Obligation	81
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	27
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	6,793
Unrecorded Unconditional Purchase Obligation, Due within One Year	910
Unrecorded Unconditional Purchase Obligation, Due within Two Years	618
Unrecorded Unconditional Purchase Obligation, Due within Three Years	560
Unrecorded Unconditional Purchase Obligation, Due within Four Years	360
Unrecorded Unconditional Purchase Obligation, Due within Five Years	355
Unrecorded Unconditional Purchase Obligation, Due after Five Years	$ 3,990