Recent Financing Transactions - EEGH (Details) - USD ($) $ in Millions	Jun. 30, 2021	May 31, 2021
EEGH
Debt Instrument [Line Items]
Face amount	$ 650	$ 2,250
EGTS
Debt Instrument [Line Items]
Face amount	1,600
EEGH 3.6% Senior Notes, due 2024 | EEGH
Debt Instrument [Line Items]
Face amount		450
EEGH 3% Senior Notes, due 2029 | EEGH
Debt Instrument [Line Items]
Face amount		600
EEGH 4.8% Senior Notes, due 2043 | EEGH
Debt Instrument [Line Items]
Face amount		400
EEGH 4.6% Senior Notes, due 2044 | EEGH
Debt Instrument [Line Items]
Face amount		500
EEGH 3.9% Senior Notes, due 2049 | EEGH
Debt Instrument [Line Items]
Face amount		$ 300
3.6% Senior Notes due 2024 | EEGH
Debt Instrument [Line Items]
Face amount	$ 339
Stated interest rate	3.60%
3.6% Senior Notes due 2024 | EGTS
Debt Instrument [Line Items]
Face amount	$ 111
3.0% Senior Notes due 2029 | EEGH
Debt Instrument [Line Items]
Face amount	$ 174
Stated interest rate	3.00%
3.0% Senior Notes due 2029 | EGTS
Debt Instrument [Line Items]
Face amount	$ 426
4.8% Senior Notes due 2043 | EEGH
Debt Instrument [Line Items]
Face amount	$ 54
Stated interest rate	4.80%
4.8% Senior Notes due 2043 | EGTS
Debt Instrument [Line Items]
Face amount	$ 346
4.6% Senior Notes due 2044 | EEGH
Debt Instrument [Line Items]
Face amount	$ 56
Stated interest rate	4.60%
4.6% Senior Notes due 2044 | EGTS
Debt Instrument [Line Items]
Face amount	$ 444
3.9% Senior Notes due 2049 | EEGH
Debt Instrument [Line Items]
Face amount	$ 27
Stated interest rate	3.90%
3.9% Senior Notes due 2049 | EGTS
Debt Instrument [Line Items]
Face amount	$ 273