Accrued Expenses and Other Long-Term Liabilities (Details) - USD ($) $ in Millions		Dec. 31, 2020	Dec. 31, 2019
Accrued Expenses
Operating lease liabilities, current		$ 285	$ 331
Defined benefit plan liabilities, current		45	37
Environmental liabilities, current		59	27
Wage and other employee-related liabilities, current		210	292
Accrued interest expense, current		99	83
Contract liabilities from contracts with customers, current		56	55
Environmental credit obligations, current		159	31
Other accrued liabilities, current		81	93
Accrued expenses		994	949
Other Long-Term Liabilities
Operating lease liabilities, noncurrent		885	959
Liability for unrecognized tax benefits, noncurrent		859	954
Defined benefit plan liabilities, noncurrent		878	834
Repatriation tax liability, noncurrent	[1]	422	508
Environmental liabilities, noncurrent		272	319
Wage and other employee-related liabilities, noncurrent		124	121
Other accrued liabilities, noncurrent		180	192
Other long-term liabilities		3,620	3,887
Accrued Expenses and Other Long-Term Liabilities (Textual)
Current portion of repatriation tax liability, included in income taxes payable		$ 54	$ 54

[1] The current portion of repatriation tax liability is included in income taxes payable and was $54 million as of December 31, 2020 and 2019.