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Long-term Debt - EGTS (Details) - USD ($) $ in Millions		12 Months Ended
Long-term Debt - EGTS (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Par value		$ 52,313
Subsidiary debt, current		2,740	$ 3,201
Subsidiary debt, noncurrent		36,231	35,238
EGTS
Debt Instrument [Line Items]
Par value		1,600
Unrealized losses on cash flow hedges, net of tax	$ 32	(2)	(1)	$ 31
Debt extinguished	1,900
Subsidiary debt		1,583	1,582
Subsidiary debt, current		111	0
Subsidiary debt, noncurrent		1,472	1,582
EGTS \| Senior notes
Debt Instrument [Line Items]
Par value	1,600
Unamortized discounts and debt issuance costs	17
Payments of debt issuance costs	$ 2
EGTS \| 3.60% Senior Notes, due 2024 \| Senior notes
Debt Instrument [Line Items]
Par value		$ 111
Stated rate		3.60%
Subsidiary debt		$ 111	110
EGTS \| 3.00% Senior Notes, due 2029 \| Senior notes
Debt Instrument [Line Items]
Par value		$ 426
Stated rate		3.00%
Subsidiary debt		$ 422	422
EGTS \| 4.80% Senior Notes, due 2043 \| Senior notes
Debt Instrument [Line Items]
Par value		$ 346
Stated rate		4.80%
Subsidiary debt		$ 342	342
EGTS \| 4.60% Senior Notes, due 2044 \| Senior notes
Debt Instrument [Line Items]
Par value		$ 444
Stated rate		4.60%
Subsidiary debt		$ 437	437
EGTS \| 3.90% Senior Notes, due 2049 \| Senior notes
Debt Instrument [Line Items]
Par value		$ 273
Stated rate		3.90%
Subsidiary debt		$ 271	$ 271