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Revenue Recognition (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Increase in contract assets due to business acquisition | $ 153 |  |  |
Increase in contract liabilities due to business acquisition | 117 |  |  |
Revenue recognized which was included in the contract liability balance | 380 | $ 450 |  |
Capitalized contract costs, amortization | 105 | 106 |  |
Capitalized contract cost, impairment loss | 0 | 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 | 357 | 322 |  |
Conversion or Implementation Costs |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Capitalized contract costs | $ 176 | $ 97 |  |

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