Employee Benefit Plans - PAC - Unrecognized Amounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Other Postretirement
Defined Benefit Plan Disclosure [Line Items]
Net loss (gain)	$ (38)	$ (34)
Regulatory deferrals	1	2
Total	(16)	(33)
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Beginning balance	(33)	28
Net loss (gain) arising during the year	(4)	(65)
Net amortization	1	3
Total	17	(61)
Ending balance	(16)	(33)
Other Postretirement | Regulatory Asset
Defined Benefit Plan Disclosure [Line Items]
Total	45	11
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Beginning balance	11	47
Net loss (gain) arising during the year	20	(40)
Net amortization	3	3
Total	34	(36)
Ending balance	45	11
Other Postretirement | Regulatory Liability
Defined Benefit Plan Disclosure [Line Items]
Total	(59)	(45)
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Beginning balance	(45)	(23)
Net loss (gain) arising during the year	(20)	(22)
Net amortization	(2)	0
Total	(14)	(22)
Ending balance	(59)	(45)
Other Postretirement | PAC
Defined Benefit Plan Disclosure [Line Items]
Net loss (gain)	(36)	(28)
Regulatory deferrals	1	2
Total	(35)	(26)
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Beginning balance	(26)
Ending balance	(35)	(26)
Other Postretirement | PAC | Regulatory Liability
Defined Benefit Plan Disclosure [Line Items]
Total	(35)	(26)
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Beginning balance	(26)	(10)
Net loss (gain) arising during the year	(8)	(15)
Net amortization	(1)	(1)
Total	(9)	(16)
Ending balance	(35)	(26)
U.S. | Pension
Defined Benefit Plan Disclosure [Line Items]
Net loss (gain)	365	343
Regulatory deferrals	29	11
Total	390	353
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Beginning balance	353	613
Net loss (gain) arising during the year	76	(231)
Net amortization	(19)	(25)
Settlement	(17)	4
Total	37	(260)
Ending balance	390	353
U.S. | Pension | Regulatory Asset
Defined Benefit Plan Disclosure [Line Items]
Total	418	390
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Beginning balance	390	600
Net loss (gain) arising during the year	58	(177)
Net amortization	(17)	(24)
Settlement	(13)	9
Total	28	(210)
Ending balance	418	390
U.S. | Pension | Regulatory Liability
Defined Benefit Plan Disclosure [Line Items]
Total	(28)	(59)
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Beginning balance	(59)	(20)
Net loss (gain) arising during the year	38	(44)
Net amortization	0	0
Settlement	(4)	(5)
Total	31	(39)
Ending balance	(28)	(59)
U.S. | Pension | PAC
Defined Benefit Plan Disclosure [Line Items]
Net loss (gain)	273	298
Regulatory deferrals	29	11
Total	302	309
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Beginning balance	309	457
Net loss (gain) arising during the year	15	(121)
Net amortization	(16)	(21)
Settlement	(6)	(6)
Total	(7)	(148)
Ending balance	302	309
U.S. | Pension | PAC | Regulatory Asset
Defined Benefit Plan Disclosure [Line Items]
Total	290	286
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Beginning balance	286	432
Net loss (gain) arising during the year	24	(120)
Net amortization	(14)	(20)
Settlement	(6)	(6)
Total	4	(146)
Ending balance	290	286
U.S. | Pension | PAC | Accumulated Other Comprehensive Income (Loss)
Defined Benefit Plan Disclosure [Line Items]
Total	12	23
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Beginning balance	23	25
Net loss (gain) arising during the year	(9)	(1)
Net amortization	(2)	(1)
Settlement	0	0
Total	(11)	(2)
Ending balance	$ 12	$ 23