Debt (Senior Note Offering) (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)
Senior Notes Due 2029 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.90%
Debt Instrument, Face Amount	$ 600
Subordinated Debentures Due 2052
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.125%
Debt Instrument, Face Amount	$ 700
Senior Notes Due 2033
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.00%
Debt Instrument, Face Amount	$ 400
Debt Related Commitment Fees and Debt Issuance Costs	$ 4
Senior Notes Due 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.70%
Debt Instrument, Face Amount	$ 400
Senior Notes Due 2034
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.75%
Debt Instrument, Face Amount	$ 650
Debt Related Commitment Fees and Debt Issuance Costs	$ 6