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Revenue Recognition - Contract Asset (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Contract Assets |  |  |
Balance at December 31, 2017 | $ 0 |  |
Change in accounting policy |  |  | $ 176
Contract additions | 23 |  |
Terminated contracts | (1) |  |
Reclassified to receivables | (39) |  |
Balance at December 31, 2018 | $ 9 |  |
Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |
Contract Assets |  |  |
Change in accounting policy |  | $ 26 |

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- Definition Amount of decrease in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time from transfer to receivable due to right to consideration becoming unconditional. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130551-203045 + Details
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- Definition Amount of increase(decrease) in revenue recognized from contract terminations which increases (decreases) right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References No definition available. + Details
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