Long-term Debt - EGTS - AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Interest expense	$ 2,415	$ 2,216	$ 2,118
EGTS
Debt Instrument [Line Items]
Interest expense	71	69	78
Interest rate derivatives | EGTS
Debt Instrument [Line Items]
AOCI After-Tax	(28)
Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax	$ (2)
Maximum Term	252 months
Interest rate derivatives | EGTS | Reclassification out of Accumulated Other Comprehensive Income | Cash flow hedge
Debt Instrument [Line Items]
Interest expense	$ 3	$ 2	$ 1