New Accounting Standards (Details) - Accounting Standards Update 2015-03 [Member] $ in Millions	Dec. 31, 2015 USD ($)
Deferred charges and other assets [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred finance costs	$ (43)
Short-term Debt [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred finance costs	1
Long-term Debt [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred finance costs	$ 42