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Debt and Financing Activities - Commercial Paper (Details) - Commercial Paper - USD ($)
Dec. 31, 2015
Nov. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]        
Outstanding notes (up to)   $ 3,500,000,000.0    
Outstanding obligations $ 0   $ 0 $ 0