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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 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 |  | 10 |  | 19
Interest expense, bank fees and other, net |  | 0 |  | 0
Interest expense, bank fees and other |  | (7) |  | (13)
Interest income |  | 3 |  | 5
Other comprehensive income |  | 1 |  | 0
Comprehensive income | $ 47 | 59 | $ 110 | 112
As previously reported |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Depreciation |  | 8 |  | 16
Amortization of intangible assets |  | 2 |  | 3
Depreciation and amortization of intangible assets |  | 0 |  | 0
Interest expense, bank fees and other, net |  | (4) |  | (8)
Interest expense, bank fees and other |  | 0 |  | 0
Interest income |  | 0 |  | 0
Other comprehensive income |  | 0 |  | 0
Comprehensive income |  | 58 |  | 112
Reclassified amounts |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Depreciation |  | (8) |  | (16)
Amortization of intangible assets |  | (2) |  | (3)
Depreciation and amortization of intangible assets |  | 10 |  | 19
Interest expense, bank fees and other, net |  | 4 |  | 8
Interest expense, bank fees and other |  | (7) |  | (13)
Interest income |  | 3 |  | 5
Other comprehensive income |  | 1 |  | 0
Comprehensive income |  | $ 1 |  | $ 0

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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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