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Investments in debt and equity securities (Details 2) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Less than 12 months    
Fair Value $ 338 $ 587
Unrealized Losses 3 9
12 months or more    
Fair Value 666 163
Unrealized Losses 18 5
Total    
Fair Value 1,004 750
Unrealized Losses 21 14
Corporate bonds    
Less than 12 months    
Fair Value 280 312
Unrealized Losses 3 2
12 months or more    
Fair Value 391 38
Unrealized Losses 11 0
Total    
Fair Value 671 350
Unrealized Losses 14 2
Asset-backed securities    
Less than 12 months    
Fair Value 6  
Unrealized Losses 0  
12 months or more    
Fair Value 38  
Unrealized Losses 1  
Total    
Fair Value 44  
Unrealized Losses 1  
U.S. governmental agency mortgage-backed securities    
Less than 12 months    
Fair Value 52 129
Unrealized Losses 0 1
12 months or more    
Fair Value 223 110
Unrealized Losses 5 3
Total    
Fair Value 275 239
Unrealized Losses 5 4
Commercial    
Less than 12 months    
Fair Value 0  
Unrealized Losses 0  
12 months or more    
Fair Value 14  
Unrealized Losses 1  
Total    
Fair Value 14  
Unrealized Losses $ 1  
Large capitalization value    
Less than 12 months    
Fair Value   129
Unrealized Losses   5
12 months or more    
Fair Value   14
Unrealized Losses   2
Total    
Fair Value   143
Unrealized Losses   7
Smaller company growth    
Less than 12 months    
Fair Value   17
Unrealized Losses   1
12 months or more    
Fair Value   1
Unrealized Losses   0
Total    
Fair Value   18
Unrealized Losses   $ 1