Debt (Schedule of Short-term Debt) (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Short-term Debt [Line Items]
Federal Home Loan Bank	$ 0	$ 2,550,000,000
Securities sold under agreements to repurchase	0	747,000,000
Total short-term borrowings	0	3,297,000,000
Collateral placed	0
Cash collateral received		6,000,000
Non-cash collateral received	0	1,000,000
Unsecured debt
Short-term Debt [Line Items]
Federal Home Loan Bank	0	0
Securities sold under agreements to repurchase	0	0
Total short-term borrowings	0	0
Secured debt
Short-term Debt [Line Items]
Federal Home Loan Bank	0	2,550,000,000
Securities sold under agreements to repurchase	0	747,000,000
Total short-term borrowings	$ 0	$ 3,297,000,000