Acquisitions and Divestiture (2013 Acquisition TR Businesses Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			0 Months Ended	3 Months Ended	9 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	May 31, 2013	Mar. 31, 2014	Sep. 30, 2014	Jun. 28, 2013
Business Acquisition [Line Items]
Non-cash merger and strategic initiatives	$ 20
Merger and strategic initiatives	81	22	4
2011 Credit Facility [Member]
Business Acquisition [Line Items]
Credit facility, additional borrowings		50
Customer relationships [Member]
Business Acquisition [Line Items]
Purchased intangible assets							121
Total finite-lived intangible assets, Weighted-Average Useful Life (in Years)	20 years	19 years
Technology [Member]
Business Acquisition [Line Items]
Purchased intangible assets							16
Total finite-lived intangible assets, Weighted-Average Useful Life (in Years)	5 years	5 years
Trade names [Member]
Business Acquisition [Line Items]
Purchased intangible assets							578
TR Corporate Solutions Businesses [Member]
Business Acquisition [Line Items]
Purchase consideration includes working capital adjustments				390
Business acquisition, cash paid				366
Purchase consideration		366
Business acquisition, working capital adjustments				24
Net liabilities assumed				37
Purchased intangible assets		91		91
Non-cash merger and strategic initiatives					18
Merger and strategic initiatives						33
Net assets acquired		(37)
TR Corporate Solutions Businesses [Member] | Customer relationships [Member]
Business Acquisition [Line Items]
Purchased intangible assets				89
Assumed annual revenue attrition percentage		10.00%
TR Corporate Solutions Businesses [Member] | Customer relationships [Member] | Income Approach Valuation Technique [Member]
Business Acquisition [Line Items]
Discounted cash flows tax effect		40.00%
Amortization period of intangible assets for tax purposes	15 years
Percentage of present value of cash flows generated by each customer relationship based on the estimated remaining useful life		90.00%
TR Corporate Solutions Businesses [Member] | Technology [Member]
Business Acquisition [Line Items]
Purchased intangible assets				$ 2
Total finite-lived intangible assets, Weighted-Average Useful Life (in Years)	5 years
TR Corporate Solutions Businesses [Member] | Technology [Member] | Income Approach Valuation Technique [Member]
Business Acquisition [Line Items]
Discount rate		11.00%
Discounted cash flows tax effect		40.00%
Amortization period of intangible assets for tax purposes	15 years
TR Corporate Solutions Businesses [Member] | Webhosting [Member] | Income Approach Valuation Technique [Member]
Business Acquisition [Line Items]
Pre tax royalty rate		1.50%
TR Corporate Solutions Businesses [Member] | Public Relations And Multimedia [Member] | Income Approach Valuation Technique [Member]
Business Acquisition [Line Items]
Pre tax royalty rate		0.50%
Minimum [Member] | TR Corporate Solutions Businesses [Member] | Customer relationships [Member]
Business Acquisition [Line Items]
Total finite-lived intangible assets, Weighted-Average Useful Life (in Years)	9 years
Minimum [Member] | TR Corporate Solutions Businesses [Member] | Customer relationships [Member] | Income Approach Valuation Technique [Member]
Business Acquisition [Line Items]
Discount rate		11.00%
Minimum [Member] | TR Corporate Solutions Businesses [Member] | Technology [Member]
Business Acquisition [Line Items]
Total finite-lived intangible assets, Weighted-Average Useful Life (in Years)	2 years
Maximum [Member] | TR Corporate Solutions Businesses [Member] | Customer relationships [Member]
Business Acquisition [Line Items]
Total finite-lived intangible assets, Weighted-Average Useful Life (in Years)	14 years
Maximum [Member] | TR Corporate Solutions Businesses [Member] | Customer relationships [Member] | Income Approach Valuation Technique [Member]
Business Acquisition [Line Items]
Discount rate		11.50%
Maximum [Member] | TR Corporate Solutions Businesses [Member] | Technology [Member]
Business Acquisition [Line Items]
Total finite-lived intangible assets, Weighted-Average Useful Life (in Years)	5 years