10-K Leases (Lease and Other Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Assets and Liabilities, Lessee
Operating Lease, Right-of-Use Asset	$ 584	$ 604
Operating Lease, Liability, Current	164	181
Operating Lease, Liability, Noncurrent	$ 685	$ 751
Balance sheet location of operating lease right-of-use assets	Other noncurrent assets	Other noncurrent assets
Balance sheet location of current operating lease liabilities	Other current liabilities	Other current liabilities
Balance sheet location of noncurrent operating lease liabilities	Other noncurrent liabilities	Other noncurrent liabilities
Lease, Cost and Other Information [Abstract]
Operating Lease, Cost	$ 155	$ 143	$ 261
Short-term and variable lease cost	43	35	45
Sublease Income	(5)	(3)	(4)
Lease, Cost	193	175	302
Operating Lease, Payments	206	204
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 59	$ 113
Operating Lease, Weighted Average Remaining Lease Term	6 years	7 years
Weighted Average Discount Rate, Percent	3.66%	2.98%
Operating Lease, Impairment Loss	$ 23	$ 34	$ 136