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Recent Financing Transactions - NPC (Details) - NPC - USD ($) $ in Millions	1 Months Ended		6 Months Ended
	May 31, 2022	Jan. 31, 2022	Jun. 30, 2022	Jun. 30, 2021
Debt Instrument [Line Items]
Proceeds from long-term debt			$ 300	$ 0
NPC Secured Delayed Draw Term Loan Facility, Due 2024 \| Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 300
Proceeds from long-term debt	$ 100	$ 200
Interest rate during period	1.24%	0.55%
Secured credit facility, $400 million, expiring June 2025 \| Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 400