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Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On October 25, 2018, CSC’s Board of Directors terminated the existing two share repurchase authorizations and replaced them with a new authorization to repurchase up to a total of $1.0 billion of common stock. On October 31, 2018, CSC issued $500 million aggregate principal amount of Senior Notes that mature in 2024 and $600 million aggregate principal amount of Senior Notes that mature in 2029 under its universal shelf registration statement on file with the SEC. The Senior Notes due 2024 have a fixed interest rate of 3.550% with interest payable semi-annually. The Senior Notes due 2029 have a fixed interest rate of 4.000% with interest payable semi-annually.