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Description of Business and Significant Accounting Policies - Effects on income due to new accounting pronouncements (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Depreciation | $ 0 | $ 0
Amortization of intangible assets | 0 | 0
Depreciation and amortization of intangible assets | 11 | 30
Interest expense, bank fees and other, net | 0 | 0
Interest expense, bank fees and other | (5) | (17)
Interest income | 3 | 7
As previously reported |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Depreciation | 10 | 26
Amortization of intangible assets | 1 | 4
Depreciation and amortization of intangible assets | 0 | 0
Interest expense, bank fees and other, net | (2) | (10)
Interest expense, bank fees and other | 0 | 0
Interest income | 0 | 0
Reclassified amounts |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Depreciation | (10) | (26)
Amortization of intangible assets | (1) | (4)
Depreciation and amortization of intangible assets | 11 | 30
Interest expense, bank fees and other, net | 2 | 10
Interest expense, bank fees and other | (5) | (17)
Interest income | $ 3 | $ 7

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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=118932676&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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