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Investments (Details 4) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Apr. 01, 2016
Dec. 31, 2016
Dec. 31, 2015
Available-for-sale and held-to-maturity securities by balance sheet line item        
Cash and cash equivalents $ 12,120 $ 8,748 $ 8,555 $ 7,309
Marketable securities 3,294   4,051  
Other investments 1,230   989  
Other assets 4,454   4,248  
Available-for-sale Securities Fair Value 6,764   6,413  
Proceeds from Sale of Available-for-sale Securities 3,094 4,516    
Available-for-sale Securities Gross Gains 26 100    
Available-for-sale Securities Gross Losses (7) $ (30)    
Available-for-sale Securities [Member]        
Available-for-sale and held-to-maturity securities by balance sheet line item        
Cash and cash equivalents 1,521   682  
Marketable securities 2,998   3,769  
Other investments 1,088   849  
Other assets 1,157   1,113  
Available-for-sale Securities Fair Value 6,764   6,413  
Solvency capital $ 1,025   $ 985