Segment Information - Summarized Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Segment Reporting Information [Line Items]
Operating revenues	$ 1,011	$ 938
Depreciation and amortization	188	172
Total operating expenses, net	685	643
Interest expense	(124)	(115)
Interest income	24	14
Provision for (benefit from) income taxes	57	44
Net income (loss) attributable to common shareholders	185	170
Total assets	31,086	28,286	$ 30,298
Cash paid for capital expenditures	609	526
Other
Segment Reporting Information [Line Items]
Operating revenues	83	78
Depreciation and amortization	4	3
Total operating expenses, net	74	71
Interest expense	(27)	(28)
Interest income	21	13
Provision for (benefit from) income taxes	4	(2)
Net income (loss) attributable to common shareholders	0	(4)
Total assets	3,279	2,660
Cash paid for capital expenditures	6	2
Regulated Businesses | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	928	860
Depreciation and amortization	184	169
Total operating expenses, net	611	572
Interest expense	(97)	(87)
Interest income	3	1
Provision for (benefit from) income taxes	53	46
Net income (loss) attributable to common shareholders	185	174
Total assets	27,807	25,626
Cash paid for capital expenditures	$ 603	$ 524