Long-term Debt - EGTS (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Par value	$ 55,471
Subsidiary debt, current	2,646	$ 2,740
Subsidiary debt, noncurrent	41,154	36,231
EGTS
Debt Instrument [Line Items]
Par value	1,639
Subsidiary debt	1,622	1,583
Subsidiary debt, current	0	111
Subsidiary debt, noncurrent	$ 1,622	1,472
EGTS \| 3.60% Senior Notes, due 2024 \| Senior notes
Debt Instrument [Line Items]
Stated rate	3.60%
Par value	$ 0
Subsidiary debt	$ 0	111
EGTS \| 3.00% Senior Notes, due 2029 \| Senior notes
Debt Instrument [Line Items]
Stated rate	3.00%
Par value	$ 426
Subsidiary debt	$ 423	422
EGTS \| 5.02% Senior Notes, due 2034 \| Senior notes
Debt Instrument [Line Items]
Stated rate	5.02%
Par value	$ 150
Subsidiary debt	$ 149	0
EGTS \| 4.80% Senior Notes, due 2043 \| Senior notes
Debt Instrument [Line Items]
Stated rate	4.80%
Par value	$ 346
Subsidiary debt	$ 342	342
EGTS \| 4.60% Senior Notes, due 2044 \| Senior notes
Debt Instrument [Line Items]
Stated rate	4.60%
Par value	$ 444
Subsidiary debt	$ 437	437
EGTS \| 3.90% Senior Notes, due 2049 \| Senior notes
Debt Instrument [Line Items]
Stated rate	3.90%
Par value	$ 273
Subsidiary debt	$ 271	$ 271

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