Financial Instruments (Schedule of Long-term Debt) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2013 Allocated Long-term Debt	Jan. 28, 2013 Senior Notes	Dec. 31, 2013 Senior Notes Senior Notes 1.150% due 2016	Jan. 28, 2013 Senior Notes Senior Notes 1.150% due 2016	Dec. 31, 2013 Senior Notes Senior Notes 1.875% due 2018	Jan. 28, 2013 Senior Notes Senior Notes 1.875% due 2018	Dec. 31, 2013 Senior Notes Senior Notes 3.250% due 2023	Jan. 28, 2013 Senior Notes Senior Notes 3.250% due 2023	Dec. 31, 2013 Senior Notes Senior Notes 4.700% due 2043	Jan. 28, 2013 Senior Notes Senior Notes 4.700% due 2043	Dec. 31, 2012 Prior to Initial Public Offering	Dec. 31, 2012 Prior to Initial Public Offering Allocated Long-term Debt	Dec. 31, 2012 Prior to Initial Public Offering Senior Notes Senior Notes 1.150% due 2016	Dec. 31, 2012 Prior to Initial Public Offering Senior Notes Senior Notes 1.875% due 2018	Dec. 31, 2012 Prior to Initial Public Offering Senior Notes Senior Notes 3.250% due 2023	Dec. 31, 2012 Prior to Initial Public Offering Senior Notes Senior Notes 4.700% due 2043
Debt Instrument [Line Items]
Total long-term debt	$ 3,652				$ 0	$ 3,650	$ 400	$ 400	$ 750	$ 750	$ 1,350	$ 1,350	$ 1,150	$ 1,150	$ 509	$ 509	$ 0	$ 0	$ 0	$ 0
Long-term Line of Credit, Noncurrent	2
Unamortized debt discount	(10)														0
Long-term debt / Allocated long-term debt	$ 3,642	[1]	$ 0	[1]											$ 509

[1] The consolidated balance sheet as of December 31, 2013 has been prepared under a different basis of presentation than the combined balance sheet as of December 31, 2012, which significantly impacts comparability. See Note 3. Basis of Presentation.