Revenue Contract Balances (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Accounts and notes receivable - trade	[1]	$ 5,372	$ 3,843	$ 5,164
Contract assets - current	[2]	20	18	18
Contract assets - noncurrent	[3]	49	46	47
Deferred revenue recognized during the period		2,013
Accrued and Other Current Liabilities [Member]
Disaggregation of Revenue [Line Items]
Deferred Revenue	[4]	441	2,209	380
Other noncurrent obligations
Disaggregation of Revenue [Line Items]
Deferred Revenue	[5]	$ 117	$ 150	$ 120

[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 accrued and other current liabilities in the interim Condensed Consolidated Balance Sheets.

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