Revenue Contract Balances (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Accounts and notes receivable - trade	[1]	$ 5,764	$ 5,779	$ 3,917
Contract assets - current	[2]	22	20	22
Contract assets - noncurrent	[3]	53	49	54
Deferred Revenue		2,247	1,996	2,662
Deferred revenue recognized during the period		924	822
Accrued and Other Current Liabilities [Member]
Disaggregation of Revenue [Line Items]
Deferred Revenue		2,247	1,996	2,662
Other noncurrent obligations
Disaggregation of Revenue [Line Items]
Deferred Revenue	[4]	$ 111	$ 104	$ 116

[1] Included in accounts and notes receivable - net in the interim Condensed Consolidated Balance Sheets.

[2] Included in other current assets in the interim Condensed Consolidated Balance Sheets.

[3] Included in other assets in the interim Condensed Consolidated Balance Sheets.

[4] Included in other noncurrent obligations in the interim Condensed Consolidated Balance Sheets.