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Contract and Other Deferred Assets (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Jan. 01, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Contract assets (revenue in excess of billings) $ 1,652   $ 1,652   $ 1,684 $ 1,233
Deferred inventory costs (3) 245   245   360 $ 276
Non-recurring engineering costs 14   14   0  
Contract and other deferred assets 1,911   1,911   2,044  
Revenue recognized from performance obligations satisfied in previous periods 12 $ 10 22 $ 40    
Long-term product service agreements            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Contract assets (revenue in excess of billings) 593   593   589  
Long-term equipment contract revenue (1)            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Contract assets (revenue in excess of billings) $ 1,059   $ 1,059   $ 1,095