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Fair value disclosures (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Assets    
Available-for-sale securities $ 1,439 $ 1,367
Recurring basis    
Assets    
Available-for-sale securities 1,329 1,288
Total Assets 1,439 1,367
Liabilities    
Derivative Liabilities, at Fair Value, Net 19 72
Total Liabilities 19 72
U.S. treasury bonds    
Assets    
Available-for-sale securities 10 9
U.S. treasury bonds | Recurring basis    
Assets    
Available-for-sale securities 10 9
Other U.S. and non-U.S. government bonds    
Assets    
Available-for-sale securities 42 60
Other U.S. and non-U.S. government bonds | Recurring basis    
Assets    
Available-for-sale securities 42 60
Corporate bonds    
Assets    
Available-for-sale securities 584 492
Corporate bonds | Recurring basis    
Assets    
Available-for-sale securities 584 492
Asset-backed securities    
Assets    
Available-for-sale securities 67 90
Asset-backed securities | Recurring basis    
Assets    
Available-for-sale securities 67 90
U.S. governmental agency | Recurring basis    
Assets    
Available-for-sale securities 261 223
Residential    
Assets    
Available-for-sale securities 8 10
Residential | Recurring basis    
Assets    
Available-for-sale securities 8 10
Commercial    
Assets    
Available-for-sale securities 17 36
Commercial | Recurring basis    
Assets    
Available-for-sale securities 17 36
Large capitalization value    
Assets    
Available-for-sale securities 284 312
Large capitalization value | Recurring basis    
Assets    
Available-for-sale securities 284 312
REIT    
Assets    
Available-for-sale securities 110 79
REIT | Recurring basis    
Assets    
Available-for-sale securities 110 79
Smaller company growth    
Assets    
Available-for-sale securities 56 56
Smaller company growth | Recurring basis    
Assets    
Available-for-sale securities 56 56
Level 1 | Recurring basis    
Assets    
Available-for-sale securities 350 377
Total Assets 350 377
Liabilities    
Derivative Liabilities, at Fair Value, Net 0 0
Total Liabilities 0 0
Level 1 | U.S. treasury bonds | Recurring basis    
Assets    
Available-for-sale securities 10 9
Level 1 | Other U.S. and non-U.S. government bonds | Recurring basis    
Assets    
Available-for-sale securities 0 0
Level 1 | Corporate bonds | Recurring basis    
Assets    
Available-for-sale securities 0 0
Level 1 | Asset-backed securities | Recurring basis    
Assets    
Available-for-sale securities 0 0
Level 1 | U.S. governmental agency | Recurring basis    
Assets    
Available-for-sale securities 0 0
Level 1 | Residential | Recurring basis    
Assets    
Available-for-sale securities 0 0
Level 1 | Commercial | Recurring basis    
Assets    
Available-for-sale securities 0 0
Level 1 | Large capitalization value | Recurring basis    
Assets    
Available-for-sale securities 284 312
Level 1 | REIT | Recurring basis    
Assets    
Available-for-sale securities 0 0
Level 1 | Smaller company growth | Recurring basis    
Assets    
Available-for-sale securities 56 56
Level 2 | Recurring basis    
Assets    
Available-for-sale securities 979 911
Total Assets 979 911
Liabilities    
Derivative Liabilities, at Fair Value, Net 19 72
Total Liabilities 19 72
Level 2 | U.S. treasury bonds | Recurring basis    
Assets    
Available-for-sale securities 0 0
Level 2 | Other U.S. and non-U.S. government bonds | Recurring basis    
Assets    
Available-for-sale securities 42 60
Level 2 | Corporate bonds | Recurring basis    
Assets    
Available-for-sale securities 584 492
Level 2 | Asset-backed securities | Recurring basis    
Assets    
Available-for-sale securities 67 90
Level 2 | U.S. governmental agency | Recurring basis    
Assets    
Available-for-sale securities 261 223
Level 2 | Residential | Recurring basis    
Assets    
Available-for-sale securities 8 10
Level 2 | Commercial | Recurring basis    
Assets    
Available-for-sale securities 17 36
Level 2 | Large capitalization value | Recurring basis    
Assets    
Available-for-sale securities 0 0
Level 2 | REIT | Recurring basis    
Assets    
Available-for-sale securities 0 0
Level 2 | Smaller company growth | Recurring basis    
Assets    
Available-for-sale securities 0 0
Level 3 | Recurring basis    
Assets    
Available-for-sale securities 0 0
Total Assets 110 79
Liabilities    
Derivative Liabilities, at Fair Value, Net 0 0
Total Liabilities 0 0
Level 3 | U.S. treasury bonds | Recurring basis    
Assets    
Available-for-sale securities 0 0
Level 3 | Other U.S. and non-U.S. government bonds | Recurring basis    
Assets    
Available-for-sale securities 0 0
Level 3 | Corporate bonds | Recurring basis    
Assets    
Available-for-sale securities 0 0
Level 3 | Asset-backed securities | Recurring basis    
Assets    
Available-for-sale securities 0 0
Level 3 | U.S. governmental agency | Recurring basis    
Assets    
Available-for-sale securities 0 0
Level 3 | Residential | Recurring basis    
Assets    
Available-for-sale securities 0 0
Level 3 | Commercial | Recurring basis    
Assets    
Available-for-sale securities 0 0
Level 3 | Large capitalization value | Recurring basis    
Assets    
Available-for-sale securities 0 0
Level 3 | REIT | Recurring basis    
Assets    
Available-for-sale securities 110 79
Level 3 | Smaller company growth | Recurring basis    
Assets    
Available-for-sale securities $ 0 $ 0