Accounts Payable and Other Current Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Payables and Accruals [Abstract]
Compensation and benefits payable	$ 1,034	$ 760
Property and income tax liabilities	492	435
Operating leases - current	328	391
Accounts payable	314	310
Customer incentives	288	224
Accrued interest	279	277
Casualty and environmental liabilities	120	110
Capital expenditure estimated liabilities	116	74
Rents and leases	97	101
Other	828	752
Total	$ 3,896	$ 3,434