Quarterly report pursuant to Section 13 or 15(d)

Investments (Details 3)

v3.8.0.1
Investments (Details 3) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 30, 2018
Mar. 31, 2017
Dec. 31, 2017
Debt securities, by type      
Available-for-sale Securities, Amortized Cost Basis $ 5,950    
Available-for-sale Securities Fair Value 6,077    
Debt securities, cost 5,987   $ 5,794
Debt securities, gross unrealized gain 177   157
Debt securities, gross unrealized loss (50)   (27)
Debt securities 6,114   5,924
Equity Securities [Member]      
Debt securities, by type      
Available-for-sale Securities, Gross Realized Gains 0 $ 4  
Trading Securities, Equity, Cost 37   12
Trading Securities, Unrealized Holding Gain 0   0
Trading Securities, Unrealized Holding Loss 0   0
Trading Securities 37   12
Available-for-sale Securities, Debt Securities 5,950   5,782
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 177   157
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (50)   (27)
Available-for-sale Securities Fair Value 6,077   5,912
Available-for-sale Securities, Gross Realized Losses (5) (4)  
Proceeds from Sale of Available-for-sale Securities 3,087 $ 3,012  
Trading Securities [Member]      
Debt securities, by type      
Debt securities 37   12
Available-for-sale Securities [Member]      
Debt securities, by type      
Debt securities 6,077   5,912
Cash and Cash Equivalents [Member] | Trading Securities [Member]      
Debt securities, by type      
Debt securities 0   0
Cash and Cash Equivalents [Member] | Available-for-sale Securities [Member]      
Debt securities, by type      
Debt securities 612   667
Marketable Securities [Member] | Trading Securities [Member]      
Debt securities, by type      
Debt securities 37   12
Marketable Securities [Member] | Available-for-sale Securities [Member]      
Debt securities, by type      
Debt securities 5,192   4,970
Other Assets | Trading Securities [Member]      
Debt securities, by type      
Debt securities 0   0
Other Assets | Available-for-sale Securities [Member]      
Debt securities, by type      
Debt securities $ 273   $ 275