Revenue Contract Balances (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Accounts and notes receivable - trade	[1]	$ 5,779	$ 5,060	$ 4,396
Contract assets - current	[2]	20	18	20
Contract assets - noncurrent	[3]	49	46	49
Deferred revenue recognized during the period		822	677
Accrued and Other Current Liabilities [Member]
Disaggregation of Revenue [Line Items]
Deferred Revenue	[4]	1,996	2,057	2,584
Other noncurrent obligations
Disaggregation of Revenue [Line Items]
Deferred Revenue	[5]	$ 104	$ 103	$ 108

[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.