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Goodwill and Other Intangible Assets - Summary of Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Goodwill |  |  |
Gross Carrying Amount | $ 289 | $ 289 |
Net Carrying Amount | 289 | 289 |
Amortizable intangibles: |  |  |
Gross Carrying Amount | 95 | 216 |
Accumulated Amortization | (74) | (190) |
Net Carrying Amount | 21 | 26 |
Amortization of intangible assets | 5 | 5 | $ 16
Customer contracts |  |  |
Amortizable intangibles: |  |  |
Gross Carrying Amount | 90 | 210 |
Accumulated Amortization | (71) | (187) |
Net Carrying Amount | $ 19 | 23 |
Weighted Average Amortization Period | 10 years |  |
Finite-Lived Intangible Assets, Period Increase (Decrease) | $ 120 |  |
Developed technology |  |  |
Amortizable intangibles: |  |  |
Gross Carrying Amount | 5 | 6 |
Accumulated Amortization | (3) | (3) |
Net Carrying Amount | $ 2 | $ 3 |
Weighted Average Amortization Period | 5 years |  |
Finite-Lived Intangible Assets, Period Increase (Decrease) | $ 1 |  |

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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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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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