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Revenue Recognition (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Revenue recognized which was included in the contract liability balance |  | $ 450 |
Capitalized contract costs, amortization |  | 106 |
Capitalized contract cost, impairment loss |  | 0 |
Accounting Standards Update 2014-09 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative-effect adjustment of ASU adoption |  |  | $ 208
Retained Earnings | Accounting Standards Update 2014-09 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative-effect adjustment of ASU adoption |  |  | $ 208
Product |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Percentage of consolidated revenue (less than) | 4.00% |  |
Sales Commissions |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Capitalized contract costs |  | 322 |
Conversion or Implementation Costs |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Capitalized contract costs |  | $ 97 |
Minimum |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Remaining revenue performance obligation, optional exemption, contract term |  | 3 years |
Maximum |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Remaining revenue performance obligation, optional exemption, contract term |  | 5 years |

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