Lease Commitments - Cash Paid (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Operating cash flows from operating leases	$ 1,892	$ 1,670	$ 1,744
Investing cash flows from operating leases	467	398	762
Operating cash flows from finance leases	18	21	14
Financing cash flows from finance leases	$ 44	$ 193	$ 34