Long-Term Debt - CEI Term Loans and CEI Revolving Credit Facility (Narrative) (Details)	Feb. 06, 2024 USD ($)	Feb. 06, 2023 USD ($)	Oct. 05, 2022 USD ($) stepdown	Jun. 30, 2026 USD ($)	Jul. 20, 2020 USD ($)
Senior Notes | CEI Term Loan B
Long-term debt
Debt instrument, face amount		$ 2,500,000,000
Percentage of original principal amount amortization		0.25%
Senior Notes | CEI Term Loan B | SOFR | Component One | Minimum
Long-term debt
Spread on variable rate		0.50%
Senior Notes | CEI Term Loan B | Base rate
Long-term debt
Spread on variable rate		1.25%
Senior Notes | CEI Term Loan B | Applicable Margin
Long-term debt
Spread on variable rate		2.25%
Senior Notes | CEI Term Loan B-1
Long-term debt
Debt instrument, face amount	$ 2,900,000,000
Percentage of original principal amount amortization	0.25%
Senior Notes | CEI Term Loan B-1 | SOFR | Component One | Minimum
Long-term debt
Spread on variable rate	0.50%
Senior Notes | CEI Term Loan B-1 | Base rate
Long-term debt
Spread on variable rate	1.25%
Senior Notes | CEI Term Loan B-1 | Applicable Margin
Long-term debt
Spread on variable rate	2.25%
CEI Revolving Credit Facility
Long-term debt
Number of stepdowns | stepdown			3
Leverage ratio stepdown			0.05%
Line of credit facility, commitment fee percentage			0.35%
Available borrowing capacity				$ 1,900,000,000
CEI Revolving Credit Facility | Line of Credit
Long-term debt
Credit facility					$ 2,250,000,000
Amount outstanding				96,000,000
CEI Revolving Credit Facility, Permitted Use Reserves
Long-term debt
Accordion feature					40,000,000
CEI Revolving Credit Facility, Regulatory Purpose
Long-term debt
Amount outstanding				$ 56,000,000
Line of Credit | CEI Revolving Credit Facility and CEI Term Loan A | SOFR
Long-term debt
Spread on variable rate			2.25%
Line of Credit | CEI Revolving Credit Facility and CEI Term Loan A | SOFR | Component One
Long-term debt
Spread on variable rate			0.10%
Line of Credit | CEI Revolving Credit Facility and CEI Term Loan A | SOFR | Component One | Minimum
Long-term debt
Spread on variable rate			0.00%
Line of Credit | CEI Revolving Credit Facility and CEI Term Loan A | SOFR | Component Two
Long-term debt
Spread on variable rate			1.00%
Line of Credit | CEI Revolving Credit Facility and CEI Term Loan A | Fed Funds Effective Rate Overnight Index Swap Rate | Component Two
Long-term debt
Spread on variable rate			0.50%
Line of Credit | CEI Revolving Credit Facility and CEI Term Loan A | Base rate
Long-term debt
Spread on variable rate			1.25%
Line of Credit | Letter of Credit
Long-term debt
Credit facility					$ 388,000,000
Line of Credit | Secured Debt | CEI Revolving Credit Facility and CEI Term Loan A
Long-term debt
Number of stepdowns | stepdown			3
Leverage ratio stepdown			0.25%
Line of Credit | Secured Debt | CEI Term Loan A
Long-term debt
Debt instrument, face amount			$ 750,000,000
Interest rate			1.25%