Income Taxes - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Jul. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Components of Income Tax Expense (Benefit) [Line Items]
Long-term income tax receivable		$ 0	$ 744
Operating loss carryforwards		$ 10,570
Years eligible for renewable energy production tax credit		10 years
Production tax credits		$ 1,700	$ 1,400	$ 1,200
Change in tax status		(6.00%)	(2.00%)	0.00%
Unrecognized tax benefits		$ 79	$ 100
United Kingdom
Components of Income Tax Expense (Benefit) [Line Items]
Change in enacted tax rate			105
United Kingdom | Corporate tax rate, effective April 1, 2020
Components of Income Tax Expense (Benefit) [Line Items]
Change in tax status		19.00%
United Kingdom | Corporate tax rate, effective April 2023
Components of Income Tax Expense (Benefit) [Line Items]
Change in tax status		25.00%
United Kingdom | Corporate tax rate, effective April 1, 2020 further reduction
Components of Income Tax Expense (Benefit) [Line Items]
Change in tax status		17.00%
State
Components of Income Tax Expense (Benefit) [Line Items]
Operating loss carryforwards		$ 9,653
State | Iowa Senate File 2417
Components of Income Tax Expense (Benefit) [Line Items]
Operating loss carryforwards			100
Long-Term Income Tax Receivable
Components of Income Tax Expense (Benefit) [Line Items]
Long-term income tax receivable adjustments	$ 744
Parent Company
Components of Income Tax Expense (Benefit) [Line Items]
Income tax receivable (payable), related parties current		$ (113)	324
Long-term income tax receivable			$ 744