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Fair Value Disclosures (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Assets    
Investments in debt and equity securities $ 1,457 $ 1,367
Recurring basis    
Assets    
Investments in debt and equity securities 1,348 1,288
Derivative Assets (Liabilities), at Fair Value, Net 28  
Total Assets 1,485 1,367
Liabilities    
Derivative Liabilities, at Fair Value, Net   72
Total Liabilities   72
U.S. treasury bonds    
Assets    
Investments in debt and equity securities 10 9
U.S. treasury bonds | Recurring basis    
Assets    
Investments in debt and equity securities 10 9
Other U.S. and non-U.S. government bonds    
Assets    
Investments in debt and equity securities 48 60
Other U.S. and non-U.S. government bonds | Recurring basis    
Assets    
Investments in debt and equity securities 48 60
Corporate bonds    
Assets    
Investments in debt and equity securities 532 492
Corporate bonds | Recurring basis    
Assets    
Investments in debt and equity securities 532 492
Asset-backed securities    
Assets    
Investments in debt and equity securities 76 90
Asset-backed securities | Recurring basis    
Assets    
Investments in debt and equity securities 76 90
U.S. governmental agency | Recurring basis    
Assets    
Investments in debt and equity securities 243 223
Residential    
Assets    
Investments in debt and equity securities 8 10
Residential | Recurring basis    
Assets    
Investments in debt and equity securities 8 10
Commercial    
Assets    
Investments in debt and equity securities 17 36
Commercial | Recurring basis    
Assets    
Investments in debt and equity securities 17 36
Large capitalization value    
Assets    
Investments in debt and equity securities 349 312
Large capitalization value | Recurring basis    
Assets    
Investments in debt and equity securities 349 312
Smaller company growth    
Assets    
Investments in debt and equity securities 65 56
Smaller company growth | Recurring basis    
Assets    
Investments in debt and equity securities 65 56
REIT    
Assets    
Investments in debt and equity securities 109 79
REIT | Recurring basis    
Assets    
Investments in debt and equity securities 109 79
Level 1 | Recurring basis    
Assets    
Investments in debt and equity securities 424 377
Derivative Assets (Liabilities), at Fair Value, Net 0  
Total Assets 424 377
Liabilities    
Derivative Liabilities, at Fair Value, Net   0
Total Liabilities   0
Level 1 | U.S. treasury bonds | Recurring basis    
Assets    
Investments in debt and equity securities 10 9
Level 1 | Other U.S. and non-U.S. government bonds | Recurring basis    
Assets    
Investments in debt and equity securities 0 0
Level 1 | Corporate bonds | Recurring basis    
Assets    
Investments in debt and equity securities 0 0
Level 1 | Asset-backed securities | Recurring basis    
Assets    
Investments in debt and equity securities 0 0
Level 1 | U.S. governmental agency | Recurring basis    
Assets    
Investments in debt and equity securities 0 0
Level 1 | Residential | Recurring basis    
Assets    
Investments in debt and equity securities 0 0
Level 1 | Commercial | Recurring basis    
Assets    
Investments in debt and equity securities 0 0
Level 1 | Large capitalization value | Recurring basis    
Assets    
Investments in debt and equity securities 349 312
Level 1 | Smaller company growth | Recurring basis    
Assets    
Investments in debt and equity securities 65 56
Level 1 | REIT | Recurring basis    
Assets    
Investments in debt and equity securities 0 0
Level 2 | Recurring basis    
Assets    
Investments in debt and equity securities 924 911
Derivative Assets (Liabilities), at Fair Value, Net 28  
Total Assets 952 911
Liabilities    
Derivative Liabilities, at Fair Value, Net   72
Total Liabilities   72
Level 2 | U.S. treasury bonds | Recurring basis    
Assets    
Investments in debt and equity securities 0 0
Level 2 | Other U.S. and non-U.S. government bonds | Recurring basis    
Assets    
Investments in debt and equity securities 48 60
Level 2 | Corporate bonds | Recurring basis    
Assets    
Investments in debt and equity securities 532 492
Level 2 | Asset-backed securities | Recurring basis    
Assets    
Investments in debt and equity securities 76 90
Level 2 | U.S. governmental agency | Recurring basis    
Assets    
Investments in debt and equity securities 243 223
Level 2 | Residential | Recurring basis    
Assets    
Investments in debt and equity securities 8 10
Level 2 | Commercial | Recurring basis    
Assets    
Investments in debt and equity securities 17 36
Level 2 | Large capitalization value | Recurring basis    
Assets    
Investments in debt and equity securities 0 0
Level 2 | Smaller company growth | Recurring basis    
Assets    
Investments in debt and equity securities 0 0
Level 2 | REIT | Recurring basis    
Assets    
Investments in debt and equity securities 0 0
Level 3 | Recurring basis    
Assets    
Investments in debt and equity securities 0 0
Derivative Assets (Liabilities), at Fair Value, Net 0  
Total Assets 109 79
Liabilities    
Derivative Liabilities, at Fair Value, Net   0
Total Liabilities   0
Level 3 | U.S. treasury bonds | Recurring basis    
Assets    
Investments in debt and equity securities 0 0
Level 3 | Other U.S. and non-U.S. government bonds | Recurring basis    
Assets    
Investments in debt and equity securities 0 0
Level 3 | Corporate bonds | Recurring basis    
Assets    
Investments in debt and equity securities 0 0
Level 3 | Asset-backed securities | Recurring basis    
Assets    
Investments in debt and equity securities 0 0
Level 3 | U.S. governmental agency | Recurring basis    
Assets    
Investments in debt and equity securities 0 0
Level 3 | Residential | Recurring basis    
Assets    
Investments in debt and equity securities 0 0
Level 3 | Commercial | Recurring basis    
Assets    
Investments in debt and equity securities 0 0
Level 3 | Large capitalization value | Recurring basis    
Assets    
Investments in debt and equity securities 0 0
Level 3 | Smaller company growth | Recurring basis    
Assets    
Investments in debt and equity securities 0 0
Level 3 | REIT | Recurring basis    
Assets    
Investments in debt and equity securities $ 109 $ 79