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Revenue Contract Balances (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]    
Accounts and notes receivable - trade [1] $ 3,917 $ 4,396
Contract assets - current [2] 22 20
Contract assets - noncurrent [3] 54 49
Deferred Revenue Recognized During the Period 2,540 2,146
Accrued and Other Current Liabilities [Member]    
Disaggregation of Revenue [Line Items]    
Deferred Revenue [4] 2,662 2,584
Other Noncurrent Obligations [Member]    
Disaggregation of Revenue [Line Items]    
Deferred Revenue [5] $ 116 $ 108
[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.