Leases (Maturity Schedule) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Operating Leases
Total operating lease liability	$ 6,010	$ 5,594
Finance Leases
Total finance lease liability	2,042	$ 1,589
Operating Lease [Member]
Operating Leases
2024	1,807
2025	1,464
2026	1,046
2027	577
2028	307
2029 and beyond	1,781
Total operating lease payments	6,982
Operating lease - discount to present value	(972)
Total operating lease liability	6,010
Finance Lease [Member]
Finance Leases
2024	243
2025	237
2026	234
2027	224
2028	241
2029 and beyond	2,256
Total finance lease payments	3,435
Finance lease - discount to present value	(1,393)
Total finance lease liability	$ 2,042