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Fair Value Disclosures (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Recurring basis    
Assets    
Available-for-sale securities, debt securities $ 1,100 $ 989
Equity securities 470 450
Total Assets 1,570 1,439
Liabilities    
Derivative Liabilities, at Fair Value, Net 37 19
Total Liabilities 37 19
U.S. treasury bonds | Recurring basis    
Assets    
Available-for-sale securities, debt securities 9 10
Other U.S. and non-U.S. government bonds | Recurring basis    
Assets    
Available-for-sale securities, debt securities 47 42
Corporate bonds | Recurring basis    
Assets    
Available-for-sale securities, debt securities 665 584
Asset-backed securities | Recurring basis    
Assets    
Available-for-sale securities, debt securities 61 67
U.S. governmental agency | Recurring basis    
Assets    
Available-for-sale securities, debt securities 296 261
Residential | Recurring basis    
Assets    
Available-for-sale securities, debt securities 7 8
Commercial | Recurring basis    
Assets    
Available-for-sale securities, debt securities 15 17
Large capitalization value | Recurring basis    
Assets    
Equity securities 285 284
Smaller company growth | Recurring basis    
Assets    
Equity securities 70 56
REIT | Recurring basis    
Assets    
Equity securities 115 110
Level 1 | Recurring basis    
Assets    
Available-for-sale securities, debt securities 9 10
Equity securities 355 340
Total Assets 364 350
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, debt securities 9 10
Level 1 | Other U.S. and non-U.S. government bonds | Recurring basis    
Assets    
Available-for-sale securities, debt securities 0 0
Level 1 | Corporate bonds | Recurring basis    
Assets    
Available-for-sale securities, debt securities 0 0
Level 1 | Asset-backed securities | Recurring basis    
Assets    
Available-for-sale securities, debt securities 0 0
Level 1 | U.S. governmental agency | Recurring basis    
Assets    
Available-for-sale securities, debt securities 0 0
Level 1 | Residential | Recurring basis    
Assets    
Available-for-sale securities, debt securities 0 0
Level 1 | Commercial | Recurring basis    
Assets    
Available-for-sale securities, debt securities 0 0
Level 1 | Large capitalization value | Recurring basis    
Assets    
Equity securities 285 284
Level 1 | Smaller company growth | Recurring basis    
Assets    
Equity securities 70 56
Level 1 | REIT | Recurring basis    
Assets    
Equity securities 0 0
Level 2 | Recurring basis    
Assets    
Available-for-sale securities, debt securities 1,091 979
Equity securities 0 0
Total Assets 1,091 979
Liabilities    
Derivative Liabilities, at Fair Value, Net 37 19
Total Liabilities 37 19
Level 2 | U.S. treasury bonds | Recurring basis    
Assets    
Available-for-sale securities, debt securities 0 0
Level 2 | Other U.S. and non-U.S. government bonds | Recurring basis    
Assets    
Available-for-sale securities, debt securities 47 42
Level 2 | Corporate bonds | Recurring basis    
Assets    
Available-for-sale securities, debt securities 665 584
Level 2 | Asset-backed securities | Recurring basis    
Assets    
Available-for-sale securities, debt securities 61 67
Level 2 | U.S. governmental agency | Recurring basis    
Assets    
Available-for-sale securities, debt securities 296 261
Level 2 | Residential | Recurring basis    
Assets    
Available-for-sale securities, debt securities 7 8
Level 2 | Commercial | Recurring basis    
Assets    
Available-for-sale securities, debt securities 15 17
Level 2 | Large capitalization value | Recurring basis    
Assets    
Equity securities 0 0
Level 2 | Smaller company growth | Recurring basis    
Assets    
Equity securities 0 0
Level 2 | REIT | Recurring basis    
Assets    
Equity securities 0 0
Level 3 | Recurring basis    
Assets    
Available-for-sale securities, debt securities 0 0
Equity securities 0 110
Total Assets 0 110
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, debt securities 0 0
Level 3 | Other U.S. and non-U.S. government bonds | Recurring basis    
Assets    
Available-for-sale securities, debt securities 0 0
Level 3 | Corporate bonds | Recurring basis    
Assets    
Available-for-sale securities, debt securities 0 0
Level 3 | Asset-backed securities | Recurring basis    
Assets    
Available-for-sale securities, debt securities 0 0
Level 3 | U.S. governmental agency | Recurring basis    
Assets    
Available-for-sale securities, debt securities 0 0
Level 3 | Residential | Recurring basis    
Assets    
Available-for-sale securities, debt securities 0 0
Level 3 | Commercial | Recurring basis    
Assets    
Available-for-sale securities, debt securities 0 0
Level 3 | Large capitalization value | Recurring basis    
Assets    
Equity securities 0 0
Level 3 | Smaller company growth | Recurring basis    
Assets    
Equity securities 0 0
Level 3 | REIT | Recurring basis    
Assets    
Equity securities 0 110
Fair Value Measured on Net Asset Value (NAV) [Member] | Recurring basis    
Assets    
Available-for-sale securities, debt securities 0  
Equity securities 115  
Total Assets 115  
Liabilities    
Derivative Liabilities, at Fair Value, Net 0  
Total Liabilities 0  
Fair Value Measured on Net Asset Value (NAV) [Member] | U.S. treasury bonds | Recurring basis    
Assets    
Available-for-sale securities, debt securities 0  
Fair Value Measured on Net Asset Value (NAV) [Member] | Other U.S. and non-U.S. government bonds | Recurring basis    
Assets    
Available-for-sale securities, debt securities 0  
Fair Value Measured on Net Asset Value (NAV) [Member] | Corporate bonds | Recurring basis    
Assets    
Available-for-sale securities, debt securities 0  
Fair Value Measured on Net Asset Value (NAV) [Member] | Asset-backed securities | Recurring basis    
Assets    
Available-for-sale securities, debt securities 0  
Fair Value Measured on Net Asset Value (NAV) [Member] | U.S. governmental agency | Recurring basis    
Assets    
Available-for-sale securities, debt securities 0  
Fair Value Measured on Net Asset Value (NAV) [Member] | Residential | Recurring basis    
Assets    
Available-for-sale securities, debt securities 0  
Fair Value Measured on Net Asset Value (NAV) [Member] | Commercial | Recurring basis    
Assets    
Available-for-sale securities, debt securities 0  
Fair Value Measured on Net Asset Value (NAV) [Member] | Large capitalization value | Recurring basis    
Assets    
Equity securities 0  
Fair Value Measured on Net Asset Value (NAV) [Member] | Smaller company growth | Recurring basis    
Assets    
Equity securities 0  
Fair Value Measured on Net Asset Value (NAV) [Member] | REIT | Recurring basis    
Assets    
Equity securities 115  
Financial Products | Level 3 | Nonrecurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Impaired Financing Receivable, Recorded Investment $ 320 $ 341