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Lease liability and Right-of-use assets (Details 5) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of quantitative information about right-of-use assets [line items]    
Interest expense on lease liabilities $ 67 $ 66
Expense relating to short-term leases for which recognition exemption has been used 4 7
Expense relating to leases of low-value assets for which recognition exemption has been used 7 8
Cash outflow 379 339
Cash outflows for short term and low value leases 11 15
Cash outflows for payments of leases interest 56 51
Repayment of lease liability $ 312 $ 273
Weighted average interest rate lease liabilities 3.40% 3.90%
Lease incentives $ 0 $ 33