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Acquisition Accounting Purchase Price Allocation (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012 | Apr. 30, 2013 Super Media, Inc.
--- | --- | --- | ---
Fair value of assets acquired |  |  |
Cash and cash equivalents |  |  | $ 154
Accounts receivable |  |  | 104
Unbilled accounts receivable |  |  | 316
Other current assets |  |  | 64
Fixed assets and capitalized software |  |  | 42
Intangible assets |  |  | 635
Goodwill | 396 | 0 | 396
Pension assets |  |  | 58
Other non-current assets |  |  | 4
Total fair value of assets acquired |  |  | 1,773
Fair value of liabilities acquired |  |  |
Accounts payable and accrued liabilities |  |  | 114
Long-term debt (including current maturities) |  |  | 1,082
Employee benefit obligations |  |  | 99
Unrecognized tax benefits |  |  | 45
Deferred tax liabilities |  |  | 351
Total fair value of liabilities acquired |  |  | 1,691
Total allocable purchase price |  |  | $ 82

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