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Revenue Contract Balances (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Disaggregation of Revenue [Line Items]      
Accounts and notes receivable - trade [1] $ 5,763 $ 5,787 $ 3,917
Contract assets - current [2] 23 21 22
Contract assets - noncurrent [3] 56 51 54
Deferred Revenue 748 431 2,662
Deferred revenue recognized during the period 2,464 2,271  
Accrued and Other Current Liabilities [Member]      
Disaggregation of Revenue [Line Items]      
Deferred Revenue 748 431 2,662
Other noncurrent obligations      
Disaggregation of Revenue [Line Items]      
Deferred Revenue [4] $ 111 $ 109 $ 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.