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Debt Long-term Debt Footnote P (Details) - USD ($)
$ in Millions
1 Months Ended
May 31, 2009
Dec. 31, 2016
Jan. 02, 2016
Mar. 31, 2012
Feb. 28, 2011
Debt Instrument [Line Items]          
Notional amount of derivatives   $ 4,018 $ 1,680    
4.45% U.S. Notes Due 2016 [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount $ 750        
Debt Instrument, Term 7 years        
Debt instrument, stated interest rate 4.45%        
Debt Instrument, Interest Rate, Effective Percentage 4.10%        
Notional amount of derivatives       $ 550 $ 200