Lease Accounting - Components of Leases on BS (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Operating lease current liabilities	$ 47	$ 53
Accrued and other current liabilities	3,071	2,775
Non-current operating lease liabilities	814	837
Property, plant and equipment, net	81,607	75,107
Current maturities of long-term debt	680	21
Long-term debt, less current maturities	49,022	51,417
Other non-current liabilities	1,323	1,152
Operating Leases [Member]
Lessee, Lease, Description [Line Items]
Lease right-of-use assets, net	826	863
Operating lease current liabilities	47	53
Accrued and other current liabilities	1	1
Non-current operating lease liabilities	814	837
Finance Leases [Member]
Lessee, Lease, Description [Line Items]
Accrued and other current liabilities	1	1
Property, plant and equipment, net	1	1
Lease right-of-use assets, net	12	3
Current maturities of long-term debt	3	1
Long-term debt, less current maturities	9	6
Other non-current liabilities	$ 1	$ 1