Basis of Presentation and Significant Accounting Policies (Details) - USD ($) $ in Millions	Apr. 08, 2016	Apr. 03, 2016	Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt issuance costs		$ 76
Accounting Standards Update 2015-03 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt issuance costs			$ (79)
Subsequent Event [Member]
Subsequent Event [Line Items]
Payments of merger termination costs	$ 150
Other Current Assets [Member] | Accounting Standards Update 2015-03 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt issuance costs			(1)
Other Noncurrent Assets [Member] | Accounting Standards Update 2015-03 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt issuance costs			(79)
Short-term borrowings, including current portion of long-term debt [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt issuance costs		1
Short-term borrowings, including current portion of long-term debt [Member] | Accounting Standards Update 2015-03 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt issuance costs			1
Long-term debt [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt issuance costs		$ 75
Long-term debt [Member] | Accounting Standards Update 2015-03 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt issuance costs			$ 79