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Fair Value Measurements - Transfers Between Levels & Contingent Consideration (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 29, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Level 2 to Level 1 Transfers |  |  | $ 0 |  | $ 0
Contingent Consideration Commission payable |  | $ 32 |  | $ 32 |
Contingent Consideration basis |  | 4 |  |  |
Lattice |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent Consideration | $ 0 |  |  |  |
Contingent Consideration Payment Period | 4 years |  |  |  |
Lattice | Contingent Obligations |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Discount Rate |  |  |  | 16.70% |
US Treasury Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Level 1 to Level 2 Transfers |  | $ 379 | $ 300 | $ 1,300 | $ 1,100

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- Definition Discount rate which is used to value residual cash flows generated by financial assets of a securitization, asset-backed financing arrangement, or similar transfer regardless of when the transfer occurred. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109247956&loc=d3e107314-111719 + Details
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