10-K Leases (Lease and Other Information) (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	Dec. 31, 2020
Assets and Liabilities, Lessee
Operating Lease, Right-of-Use Asset	$ 573		$ 573		$ 604	$ 628
Operating Lease, Liability, Current	172		172		181	133
Operating Lease, Liability, Noncurrent	$ 695		$ 695		$ 751	$ 864
Balance sheet location of operating lease right-of-use assets	Other noncurrent assets		Other noncurrent assets		Other noncurrent assets	Other noncurrent assets
Balance sheet location of current operating lease liabilities	Other current liabilities		Other current liabilities		Other current liabilities	Other current liabilities
Balance sheet location of noncurrent operating lease liabilities	Other noncurrent liabilities		Other noncurrent liabilities		Other noncurrent liabilities	Other noncurrent liabilities
Lease, Cost and Other Information [Abstract]
Operating Lease, Cost	$ 69	$ 35	$ 126	$ 100	$ 143	$ 261	$ 438
Short-term and variable lease cost					35	45	50
Sublease Income	(1)	(1)	(4)	(3)	(3)	(4)	(9)
Lease, Cost	$ 68	$ 45	$ 150	$ 132	$ 175	$ 302	$ 479