10-K Leases (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Lessee, Lease and Other Information [Line Items]
Operating Lease, Payments	$ 53	$ 53	$ 156	$ 158	$ 204	$ 198
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 0	$ 23	$ 47	$ 62	$ 113	$ 334
Operating Lease, Weighted Average Remaining Lease Term	7 years		7 years		7 years	7 years
Weighted Average Discount Rate, Percent	3.53%		3.53%		2.98%	2.69%
Minimum [Member]
Lessee, Lease and Other Information [Line Items]
Lessee, Operating Lease, Term of Contract	1 year		1 year		1 year
Maximum [Member]
Lessee, Lease and Other Information [Line Items]
Lessee, Operating Lease, Term of Contract	12 years		12 years		12 years