Leases Supplemental balance sheet information (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Operating lease right-of-use assets	$ 236	$ 232
Finance Lease, Right-of-Use Asset	131	148
Lease, Right-of-Use Asset	$ 367	$ 380
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other liabilities	Other liabilities
Operating lease, liability, current	$ 37	$ 36
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Operating lease liabilities	Operating lease liabilities
Operating lease liabilities	$ 200	$ 208
Lease Liability	410	445
Operating Leased Assets [Line Items]
Finance Lease, Right-of-Use Asset	131	148
Operating leases (Note 17)	$ 37	$ 36
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Short-term borrowings and current installments of long-term debt - third party and affiliates	Short-term borrowings and current installments of long-term debt - third party and affiliates
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Long-term debt, net of unamortized deferred financing costs	Long-term debt, net of unamortized deferred financing costs
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Property, plant and equipment (net of accumulated depreciation - 2021: $3,484; 2020: $3,279)	Property, plant and equipment (net of accumulated depreciation - 2021: $3,484; 2020: $3,279)
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Operating lease right-of-use assets	Operating lease right-of-use assets
Property, Plant and Equipment
Leases [Abstract]
Finance Lease, Right-of-Use Asset	$ 131	$ 148
Operating Leased Assets [Line Items]
Finance Lease, Right-of-Use Asset	131	148
Other Current Liabilities [Member]
Leases [Abstract]
Operating lease, liability, current	37	36
Operating Leased Assets [Line Items]
Operating leases (Note 17)	37	36
Long-term Debt [Member]
Leases [Abstract]
Finance Lease, Liability, Noncurrent	148	171
Operating Leased Assets [Line Items]
Finance Lease, Liability, Noncurrent	148	171
Short-term Debt [Member]
Leases [Abstract]
Finance Lease, Liability, Current	25	30
Operating Leased Assets [Line Items]
Finance Lease, Liability, Current	$ 25	$ 30