Revenue Contract Balances (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Accounts and notes receivable - trade	[1]	$ 4,396	$ 3,843
Contract assets - current	[2]	20	18
Contract assets - noncurrent	[3]	49	46
Deferred Revenue Recognized During the Period		2,146	1,967
Accrued and Other Current Liabilities [Member]
Disaggregation of Revenue [Line Items]
Deferred Revenue	[4]	2,584	2,209
Other Noncurrent Obligations [Member]
Disaggregation of Revenue [Line Items]
Deferred Revenue	[5]	$ 108	$ 150

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

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

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

[4] Included in accrued and other current liabilities in the Consolidated Balance Sheets.

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