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Gross amount of debt extinguished.

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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, 2022	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Par value		$ 51,702
Long-term debt		51,635	$ 49,762
EGTS
Debt Instrument [Line Items]
Par value		1,600
Unrealized losses on cash flow hedges, net of tax	$ 32	(1)	31	$ 0
Debt extinguished	1,900
Long-term debt		1,582	1,581
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%
Long-term debt		$ 110	110
EGTS \| 3.00% Senior Notes, due 2029 \| Senior notes
Debt Instrument [Line Items]
Par value		$ 426
Stated rate		3.00%
Long-term debt		$ 422	422
EGTS \| 4.80% Senior Notes, due 2043 \| Senior notes
Debt Instrument [Line Items]
Par value		$ 346
Stated rate		4.80%
Long-term debt		$ 342	341
EGTS \| 4.60% Senior Notes, due 2044 \| Senior notes
Debt Instrument [Line Items]
Par value		$ 444
Stated rate		4.60%
Long-term debt		$ 437	437
EGTS \| 3.90% Senior Notes, due 2049 \| Senior notes
Debt Instrument [Line Items]
Par value		$ 273
Stated rate		3.90%
Long-term debt		$ 271	$ 271