Revenue Contract Balances (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Accounts and notes receivable - trade	[1]	$ 4,744	$ 4,638	$ 3,917
Contract assets - current	[2]	24	21	22
Contract assets - noncurrent	[3]	60	52	54
Deferred Revenue		692	402	2,662
Deferred revenue recognized during the period		2,454	2,195
Accrued and Other Current Liabilities [Member]
Disaggregation of Revenue [Line Items]
Deferred Revenue		692	402	2,662
Other noncurrent obligations
Disaggregation of Revenue [Line Items]
Deferred Revenue	[4]	$ 111	$ 106	$ 116

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

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

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

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