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Other Financial Data - Investments (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
Dec. 31, 2016
Available-for-sale securities:          
Cost Basis $ 12   $ 12   $ 56
Unrealized Gains 8   8   0
Investments 20   20   56
Other investments 215   215   211
Equity method investments 14   14   17
Investments, Cost Basis 241   241   284
Investments 249   249   284
Less: current portion of available-for-sale securities 0   0   46
Long-term investments noncurrent 249   249   238
Cash surrender value of life insurance 141   141   135
Gains (losses) on sales of investments and businesses, net 0 $ 7 3 $ (13)  
Technology-drivent Startup Companies          
Available-for-sale securities:          
Other investments 74   74   76
Government, agency, and government-sponsored enterprise obligations          
Available-for-sale securities:          
Cost Basis 5   5   51
Unrealized Gains 0   0   0
Investments 5   5   51
Corporate bonds          
Available-for-sale securities:          
Cost Basis 2   2   5
Unrealized Gains 0   0   0
Investments 2   2   $ 5
Common stock          
Available-for-sale securities:          
Cost Basis 5   5    
Unrealized Gains 8   8    
Investments $ 13   $ 13    
United Kingdom Treasury Securities          
Available-for-sale securities:          
Gains (losses) on sales of investments and businesses, net       6  
Gross realized loss on securities       $ 19