Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Operating cash flows for operating leases	$ 428	$ 504
Operating cash flows for finance leases	14	22
Financing cash flows for finance leases	186	48
Right-of-use assets obtained in exchange for lease obligations, Operating leases	$ 35	$ 27