Income Taxes - Deferred Tax Asset of U.S. Consolidated Federal Income Tax Group (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Unrecognized tax benefits, if recognized would favorably affect the effective tax rate	$ 1,400	$ 1,200	$ 1,100
Unrecognized tax benefits, interest and penalties accrued	52	63	69
Unrecognized tax benefits, interest net of the federal (benefit) expense and penalties	$ (11)	$ (2)	$ (207)