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Fair Value Disclosures (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Recurring basis    
Assets    
Available-for-sale securities, debt securities $ 1,225 $ 1,151
Equity securities 467 425
Derivative Assets (Liabilities), at Fair Value, Net 25  
Total Assets 1,717 1,576
Liabilities    
Derivative Liabilities, at Fair Value, Net   19
Total Liabilities   19
U.S. treasury bonds | Recurring basis    
Assets    
Available-for-sale securities, debt securities 9 9
Other U.S. and non-U.S. government bonds | Recurring basis    
Assets    
Available-for-sale securities, debt securities 50 42
Corporate bonds | Recurring basis    
Assets    
Available-for-sale securities, debt securities 777 720
Asset-backed securities | Recurring basis    
Assets    
Available-for-sale securities, debt securities 61 63
U.S. governmental agency | Recurring basis    
Assets    
Available-for-sale securities, debt securities 304 297
Residential | Recurring basis    
Assets    
Available-for-sale securities, debt securities 7 7
Commercial | Recurring basis    
Assets    
Available-for-sale securities, debt securities 17 13
Large capitalization value | Recurring basis    
Assets    
Equity securities 294 260
Smaller company growth | Recurring basis    
Assets    
Equity securities 53 46
REIT | Recurring basis    
Assets    
Equity securities 120 119
Level 1 | Recurring basis    
Assets    
Available-for-sale securities, debt securities 9 9
Equity securities 347 306
Derivative Assets (Liabilities), at Fair Value, Net 0  
Total Assets 356 315
Liabilities    
Derivative Liabilities, at Fair Value, Net   0
Total Liabilities   0
Level 1 | U.S. treasury bonds | Recurring basis    
Assets    
Available-for-sale securities, debt securities 9 9
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 294 260
Level 1 | Smaller company growth | Recurring basis    
Assets    
Equity securities 53 46
Level 1 | REIT | Recurring basis    
Assets    
Equity securities 0 0
Level 2 | Recurring basis    
Assets    
Available-for-sale securities, debt securities 1,216 1,142
Equity securities 0 0
Derivative Assets (Liabilities), at Fair Value, Net 25  
Total Assets 1,241 1,142
Liabilities    
Derivative Liabilities, at Fair Value, Net   19
Total Liabilities   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 50 42
Level 2 | Corporate bonds | Recurring basis    
Assets    
Available-for-sale securities, debt securities 777 720
Level 2 | Asset-backed securities | Recurring basis    
Assets    
Available-for-sale securities, debt securities 61 63
Level 2 | U.S. governmental agency | Recurring basis    
Assets    
Available-for-sale securities, debt securities 304 297
Level 2 | Residential | Recurring basis    
Assets    
Available-for-sale securities, debt securities 7 7
Level 2 | Commercial | Recurring basis    
Assets    
Available-for-sale securities, debt securities 17 13
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 0
Derivative Assets (Liabilities), at Fair Value, Net 0  
Total Assets 0 0
Liabilities    
Derivative Liabilities, at Fair Value, Net   0
Total Liabilities   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 0
Fair Value Measured on Net Asset Value (NAV) [Member] | Recurring basis    
Assets    
Equity securities 120 119
Total Assets 120 119
Fair Value Measured on Net Asset Value (NAV) [Member] | REIT | Recurring basis    
Assets    
Equity securities 120 119
Financial Products | Level 3 | Nonrecurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Impaired Financing Receivable, Recorded Investment $ 426 $ 469