Investments (Tax Equity Investments - Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Carrying Value of Tax Equity Investments	$ 781		$ 1,000
Income (Loss) from Equity Method Investments	210	$ (93)
Income Tax credits and other income tax benefits	37
Tax Equity Investments Amortization Expense	$ 33