XML 56 R39.htm IDEA: XBRL DOCUMENT v3.7.0.1
Investments (Details 2) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Available-for-sale securities, by type    
Available-for-sale Securities Fair Value $ 6,764 $ 6,413
Available-for-sale Securities, Amortized Cost Basis 6,053 5,952
Available-for-sale Securities Gross Unrealized Gains 745 514
Available-for-sale Securities Gross Unrealized Losses (34) (53)
Equity Securities    
Available-for-sale securities, by type    
Available-for-sale Securities Fair Value 1,934 1,655
Available-for-sale Securities, Amortized Cost Basis 1,287 1,252
Available-for-sale Securities Gross Unrealized Gains 666 425
Available-for-sale Securities Gross Unrealized Losses (19) (22)
Debt Securities    
Available-for-sale securities, by type    
Available-for-sale Securities Fair Value 4,830 4,758
Available-for-sale Securities, Amortized Cost Basis 4,766 4,700
Available-for-sale Securities Gross Unrealized Gains 79 89
Available-for-sale Securities Gross Unrealized Losses $ (15) $ (31)