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Presentation of Financial Statements
12 Months Ended
Dec. 31, 2015
Presentation of Financial Statements [Abstract]  
Presentation of Financial Statements
Presentation of Financial Statements
The terms “Omnicom,” “the Company,” “we,” “our” and “us” each refer to Omnicom Group Inc. and its subsidiaries, unless the context indicates otherwise. The accompanying consolidated financial statements were prepared in accordance with generally accepted accounting principles in the United States (“U.S. GAAP” or “GAAP”). All intercompany balances and transactions have been eliminated.

The preparation of financial statements in conformity with U.S. GAAP requires us to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates and assumptions.