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Revenue Recognition Activity in Contract Assets and Liabilities (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
Contract Assets  
Balance, beginning of period $ 32
Additions 59
Transfer to Accounts receivable (67)
Balance, end of period 24
Contract Liabilities  
Balance, beginning of period 206
Additions 453
Transfer to Revenues (360)
Other (7)
Balance, end of period 292
Contract assets included in Other current assets 14
Contract assets included in Deferred charges and other assets 10
Contract liabilities included in Other current liabilities 80
Contract liabilities included in Other long-term liabilities and deferred credits $ 212