Long-term Debt - EGTS - Maturity Schedule (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
2025	$ 2,646
2026	1,366
2027	860
2028	1,267
2029	3,315
2030 and thereafter	46,017
Total	55,471
EGTS
Debt Instrument [Line Items]
2025	0
2026	0
2027	0
2028	0
2029	426
2030 and thereafter	1,213
Total	1,639
Unamortized discount and debt issuance costs	(17)
Subsidiary debt	$ 1,622	$ 1,583

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