v3.7.0.1
Debt (Debt Textuals) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2015
Line of Credit Facility [Line Items]      
Debt and Capital Lease Obligations $ 11,952 $ 12,179  
Debt Instruments [Abstract]      
Debt Instrument, Interest Rate, Effective Percentage 5.40%   5.50%
Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Debt and Capital Lease Obligations $ 25 0  
Notes Payable, Other Payables [Member]      
Line of Credit Facility [Line Items]      
Debt and Capital Lease Obligations $ 1,561 $ 1,597