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Fair value disclosures (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Assets    
Fair Value of debt securities $ 1,365 $ 1,151
Recurring basis    
Assets    
Fair Value of debt securities 1,365 1,151
Fair value of equity securities 346 425
Derivative Asset, at Fair Value, Net 45  
Total Assets 1,756 1,576
Liabilities    
Derivative Assets (Liabilities), at Fair Value, Net   19
Total Liabilities   19
Government debt - U.S. treasury bonds    
Assets    
Fair Value of debt securities 9 9
Government debt - U.S. treasury bonds | Recurring basis    
Assets    
Fair Value of debt securities 9 9
Other U.S. and non-U.S. government bonds    
Assets    
Fair Value of debt securities 54 42
Other U.S. and non-U.S. government bonds | Recurring basis    
Assets    
Fair Value of debt securities 54 42
Corporate bonds    
Assets    
Fair Value of debt securities 856 720
Corporate bonds | Recurring basis    
Assets    
Fair Value of debt securities 856 720
Corporate bonds - Asset-backed securities    
Assets    
Fair Value of debt securities 62 63
Corporate bonds - Asset-backed securities | Recurring basis    
Assets    
Fair Value of debt securities 62 63
U.S. governmental agency | Recurring basis    
Assets    
Fair Value of debt securities 331 297
Mortgage-backed securities - Residential    
Assets    
Fair Value of debt securities 6 7
Mortgage-backed securities - Residential | Recurring basis    
Assets    
Fair Value of debt securities 6 7
Mortgage-backed securities - Commercial    
Assets    
Fair Value of debt securities 47 13
Mortgage-backed securities - Commercial | Recurring basis    
Assets    
Fair Value of debt securities 47 13
Large capitalization value | Recurring basis    
Assets    
Fair value of equity securities 187 260
REIT | Recurring basis    
Assets    
Fair value of equity securities 126 119
Smaller company growth | Recurring basis    
Assets    
Fair value of equity securities 33 46
Level 1 | Recurring basis    
Assets    
Fair Value of debt securities 9 9
Fair value of equity securities 216 306
Derivative Asset, at Fair Value, Net 0  
Total Assets 225 315
Liabilities    
Derivative Assets (Liabilities), at Fair Value, Net   0
Total Liabilities   0
Level 1 | Government debt - U.S. treasury bonds | Recurring basis    
Assets    
Fair Value of debt securities 9 9
Level 1 | Other U.S. and non-U.S. government bonds | Recurring basis    
Assets    
Fair Value of debt securities 0 0
Level 1 | Corporate bonds | Recurring basis    
Assets    
Fair Value of debt securities 0 0
Level 1 | Corporate bonds - Asset-backed securities | Recurring basis    
Assets    
Fair Value of debt securities 0 0
Level 1 | U.S. governmental agency | Recurring basis    
Assets    
Fair Value of debt securities 0 0
Level 1 | Mortgage-backed securities - Residential | Recurring basis    
Assets    
Fair Value of debt securities 0 0
Level 1 | Mortgage-backed securities - Commercial | Recurring basis    
Assets    
Fair Value of debt securities 0 0
Level 1 | Large capitalization value | Recurring basis    
Assets    
Fair value of equity securities 187 260
Level 1 | REIT | Recurring basis    
Assets    
Fair value of equity securities 0 0
Level 1 | Smaller company growth | Recurring basis    
Assets    
Fair value of equity securities 29 46
Level 2 | Recurring basis    
Assets    
Fair Value of debt securities 1,356 1,142
Fair value of equity securities 0 0
Derivative Asset, at Fair Value, Net 45  
Total Assets 1,401 1,142
Liabilities    
Derivative Assets (Liabilities), at Fair Value, Net   19
Total Liabilities   19
Level 2 | Government debt - U.S. treasury bonds | Recurring basis    
Assets    
Fair Value of debt securities 0 0
Level 2 | Other U.S. and non-U.S. government bonds | Recurring basis    
Assets    
Fair Value of debt securities 54 42
Level 2 | Corporate bonds | Recurring basis    
Assets    
Fair Value of debt securities 856 720
Level 2 | Corporate bonds - Asset-backed securities | Recurring basis    
Assets    
Fair Value of debt securities 62 63
Level 2 | U.S. governmental agency | Recurring basis    
Assets    
Fair Value of debt securities 331 297
Level 2 | Mortgage-backed securities - Residential | Recurring basis    
Assets    
Fair Value of debt securities 6 7
Level 2 | Mortgage-backed securities - Commercial | Recurring basis    
Assets    
Fair Value of debt securities 47 13
Level 2 | Large capitalization value | Recurring basis    
Assets    
Fair value of equity securities 0 0
Level 2 | REIT | Recurring basis    
Assets    
Fair value of equity securities 0 0
Level 2 | Smaller company growth | Recurring basis    
Assets    
Fair value of equity securities 0 0
Level 3 | Recurring basis    
Assets    
Fair Value of debt securities 0 0
Fair value of equity securities 4 0
Derivative Asset, at Fair Value, Net 0  
Total Assets 4 0
Liabilities    
Derivative Assets (Liabilities), at Fair Value, Net   0
Total Liabilities   0
Level 3 | Government debt - U.S. treasury bonds | Recurring basis    
Assets    
Fair Value of debt securities 0 0
Level 3 | Other U.S. and non-U.S. government bonds | Recurring basis    
Assets    
Fair Value of debt securities 0 0
Level 3 | Corporate bonds | Recurring basis    
Assets    
Fair Value of debt securities 0 0
Level 3 | Corporate bonds - Asset-backed securities | Recurring basis    
Assets    
Fair Value of debt securities 0 0
Level 3 | U.S. governmental agency | Recurring basis    
Assets    
Fair Value of debt securities 0 0
Level 3 | Mortgage-backed securities - Residential | Recurring basis    
Assets    
Fair Value of debt securities 0 0
Level 3 | Mortgage-backed securities - Commercial | Recurring basis    
Assets    
Fair Value of debt securities 0 0
Level 3 | Large capitalization value | Recurring basis    
Assets    
Fair value of equity securities 0 0
Level 3 | REIT | Recurring basis    
Assets    
Fair value of equity securities 0 0
Level 3 | Smaller company growth | Recurring basis    
Assets    
Fair value of equity securities 4 0
Measured at NAV | Recurring basis    
Assets    
Fair value of equity securities 126 119
Total Assets 126 119
Measured at NAV | REIT | Recurring basis    
Assets    
Fair value of equity securities $ 126 $ 119