Long-term Debt - EGTS - Maturity Schedule (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
2024	$ 2,740
2025	2,674
2026	1,450
2027	865
2028	1,271
2029 and thereafter	43,313
Total	52,313
EGTS
Debt Instrument [Line Items]
2024	111
2025	0
2026	0
2027	0
2028	0
2029 and thereafter	1,489
Total	1,600
Unamortized discount and debt issuance costs	(17)
Subsidiary debt	$ 1,583	$ 1,582

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