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Summary of Significant Accounting Policies (Details) | 12 Months Ended
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Dec. 31, 2016 USD ($) agreement | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |
Cash and cash equivalents | $ 403,000,000 | $ 301,000,000 |
Restricted cash | 15,000,000 | 56,000,000 |
Reserves netted against receivables | 13,000,000 | 14,000,000 | $ 16,000,000
Goodwill, impairment loss | $ 0 | 0 | 0
Cost method investment, ownership percentage | 20.00% |  |
Initial Listing |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Listings estimated useful life | 6 years |  |
Additional Shares Listing |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Listings estimated useful life | 4 years |  |
Other |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Asset impairment charge | $ 0 | 0 | $ 0
Cash Equivalents |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Maturities | 90 days |  |
Cash and cash equivalents | $ 251,000,000 | 157,000,000 |
Minimum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Revenue recognition period | 1 year |  |
Minimum | Computer Software |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful life | 3 years |  |
Maximum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Revenue recognition period | 2 years |  |
Maximum | Computer Software |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful life | 5 years |  |
Buildings and improvements | Minimum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment estimated useful life | 10 years |  |
Buildings and improvements | Maximum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment estimated useful life | 40 years |  |
Data processing equipment and software | Minimum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment estimated useful life | 2 years |  |
Data processing equipment and software | Maximum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment estimated useful life | 5 years |  |
Furniture and Equipment | Minimum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment estimated useful life | 5 years |  |
Furniture and Equipment | Maximum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment estimated useful life | 10 years |  |
Rebranding of Trade Name |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Asset impairment charge | $ 578,000,000 | 119,000,000 |
Accounting Standards Update 2015-17 | New Accounting Pronouncement, Early Adoption, Effect |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Current deferred tax assets |  | (24,000,000) |
Current deferred tax liabilities |  | (24,000,000) |
Noncurrent deferred tax assets |  | 24,000,000 |
Noncurrent deferred tax liabilities |  | 24,000,000 |
Not Designated as Hedging Instrument | Foreign exchange forward |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Fair value of derivative instruments | $ 0 | $ 0 |
Corporate Services |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of types of license agreements | agreement | 2 |  |
Employee Stock Purchase Plan |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Percentage of fair market value of common stock | 85.00% |  |
Discount given to employees | 15.00% |  |

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- Definition Our ESPP allows eligible U.S. and non-U.S. employees to purchase a limited number of shares of our common stock at six-month intervals, called offering periods, at 85.0% of the lower of the fair market value on the first or the last day of each offering period. The 15.0% discount given to our employees is included in compensation and benefits expense in the Condensed Consolidated Statements of Income. + References No definition available. + Details
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