Employee Benefit Plans - Unrecognized Amounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Pension | U.S.
Defined Benefit Plan Disclosure [Line Items]
Net loss (gain)	$ 365	$ 343
Prior service (credit) cost	(4)	(1)
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 prior service credit arising during the year	(3)
Settlement	(17)	4
Net amortization	(19)	(25)
Total	37	(260)
Ending balance	390	353
Pension | U.S. | Accumulated Other Comprehensive Income (Loss)
Defined Benefit Plan Disclosure [Line Items]
Total	0	22
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Beginning balance	22	33
Net loss (gain) arising during the year	(20)	(10)
Net prior service credit arising during the year	0
Settlement	0	0
Net amortization	(2)	(1)
Total	(22)	(11)
Ending balance	0	22
Pension | U.S. | 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 prior service credit arising during the year	0
Settlement	(13)	9
Net amortization	(17)	(24)
Total	28	(210)
Ending balance	418	390
Pension | U.S. | 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 prior service credit arising during the year	(3)
Settlement	(4)	(5)
Net amortization	0	0
Total	31	(39)
Ending balance	(28)	(59)
Pension | United Kingdom
Defined Benefit Plan Disclosure [Line Items]
Net loss	499	400
Prior service cost	30	5
Total	529	405
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Beginning balance	405
Ending balance	529	405
Pension | United Kingdom | Accumulated Other Comprehensive Income (Loss)
Defined Benefit Plan Disclosure [Line Items]
Total	529	405
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Beginning balance	405	618
Net loss (gain) arising during the year	167	(143)
Net prior service credit arising during the year	27	0
Settlement	0	(10)
Net amortization	(24)	(55)
Foreign currency exchange rate changes	(46)	(5)
Total	124	(213)
Ending balance	529	405
Other Postretirement
Defined Benefit Plan Disclosure [Line Items]
Net loss (gain)	(38)	(34)
Prior service (credit) cost	21	(1)
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 prior service credit arising during the year	20	1
Net amortization	1	3
Total	17	(61)
Ending balance	(16)	(33)
Other Postretirement | Accumulated Other Comprehensive Income (Loss)
Defined Benefit Plan Disclosure [Line Items]
Total	(2)	1
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Beginning balance	1	4
Net loss (gain) arising during the year	(4)	(3)
Net prior service credit arising during the year	1	0
Net amortization	0	0
Total	(3)	(3)
Ending balance	(2)	1
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 prior service credit arising during the year	11	1
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 prior service credit arising during the year	8	0
Net amortization	(2)	0
Total	(14)	(22)
Ending balance	$ (59)	$ (45)