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Supplemental Balance Sheet Information - Schedule of Other Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Other liabilities    
Pension and other retiree benefits $ 1,815 $ 1,728
Restructuring accrual 10 15
Long-Term Lease Liabilities 476 491
Other 354 364
Total Other liabilities $ 2,655 $ 2,598