Fair Value of Assets and Liabilities (Changes in Level 3 Derivative Assets and Liabilities) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Equity
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value, beginning of period	$ 0	$ 0	$ 0	$ 0
Total gains (losses) (realized/unrealized):
Included in earnings	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	0	0	0	0
Other	0	0	0	0
Transfers into level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Fair Value, end of period	0	0	0	0
Unrealized Gain (Loss) for assets still held
Included in earnings	0	0	0	0
Interest Rate
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value, beginning of period	1	0	0	0
Total gains (losses) (realized/unrealized):
Included in earnings	(1)	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	0	0	0	0
Other	0	0	0	0
Transfers into level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Fair Value, end of period	0	0	0	0
Unrealized Gain (Loss) for assets still held
Included in earnings	$ 0	$ 0	$ 0	$ 0