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Investments in debt and equity securities (Details 2) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Less than 12 months    
Fair Value $ 376 $ 572
Unrealized Losses 10 14
12 months or more    
Fair Value 38 96
Unrealized Losses 3 3
Total    
Fair Value 414 668
Unrealized Losses 13 17
Corporate bonds    
Less than 12 months    
Fair Value 131 242
Unrealized Losses 1 3
12 months or more    
Fair Value 13 27
Unrealized Losses 0 1
Total    
Fair Value 144 269
Unrealized Losses 1 4
Asset-backed securities    
Less than 12 months    
Fair Value   84
Unrealized Losses   1
12 months or more    
Fair Value   10
Unrealized Losses   1
Total    
Fair Value   94
Unrealized Losses   2
U.S. governmental agency mortgage-backed securities    
Less than 12 months    
Fair Value 167 135
Unrealized Losses 2 1
12 months or more    
Fair Value 11 57
Unrealized Losses 0 1
Total    
Fair Value 178 192
Unrealized Losses 2 2
Large capitalization value    
Less than 12 months    
Fair Value 68 97
Unrealized Losses 6 8
12 months or more    
Fair Value 11 2
Unrealized Losses 2 0
Total    
Fair Value 79 99
Unrealized Losses 8 8
Smaller company growth    
Less than 12 months    
Fair Value 10 14
Unrealized Losses 1 1
12 months or more    
Fair Value 3 0
Unrealized Losses 1 0
Total    
Fair Value 13 14
Unrealized Losses $ 2 $ 1