Fair Value of Financial Instruments Unobservable Input Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance as of the beginning of the period	$ 85	$ 137
Net realized and unrealized (gains)/losses	(37)	(21)
Transfers out of Level 3 to Level 2	4	1
Balance as of the end of the period	$ 52	$ 117