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Property, Equipment, and Capitalized Software, Net - Depreciation and Amortization (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Property, Plant and Equipment [Line Items] |  |  |
Amortization of capitalized software | $ 42 | $ 64 | $ 62
Depreciation of property and equipment | 36 | 42 | 45
Amortization of intangible assets | 21 | 31 | 32
Subtotal | 99 | 137 | 139
Recorded in cost of service revenue: | 28 | 41 | 43
Total depreciation and amortization recognized | 127 | 178 | 182
Capitalized software |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Recorded in cost of service revenue: | 19 | 28 | 22
Deferred contract costs |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Recorded in cost of service revenue: | $ 9 | $ 13 | $ 21

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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