XML 45 R33.htm IDEA: XBRL DOCUMENT v3.19.2
Debt Securities - Continuous Unrealized Losses (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]          
Other than temporary impairment $ 0 $ 0 $ 0 $ 0  
Estimated fair value          
Less than 12 months 199,000,000   199,000,000   $ 4,628,000,000
12 months or more 866,000,000   866,000,000   1,055,000,000
Gross unrealized losses          
Less than 12 months 0   0   (4,000,000)
12 months or more (17,000,000)   (17,000,000)   (44,000,000)
U.S. Government and Federal Agency          
Estimated fair value          
Less than 12 months 0   0   2,838,000,000
12 months or more 0   0   0
Gross unrealized losses          
Less than 12 months 0   0   (1,000,000)
12 months or more 0   0   0
State and municipal          
Estimated fair value          
Less than 12 months 0   0   23,000,000
12 months or more 27,000,000   27,000,000   8,000,000
Gross unrealized losses          
Less than 12 months 0   0   (1,000,000)
12 months or more (1,000,000)   (1,000,000)   (1,000,000)
Residential mortgage-backed          
Estimated fair value          
Less than 12 months 22,000,000   22,000,000   102,000,000
12 months or more 792,000,000   792,000,000   933,000,000
Gross unrealized losses          
Less than 12 months 0   0   0
12 months or more (16,000,000)   (16,000,000)   (42,000,000)
Asset-backed Securities [Member]          
Estimated fair value          
Less than 12 months 177,000,000   177,000,000   1,665,000,000
12 months or more 47,000,000   47,000,000   114,000,000
Gross unrealized losses          
Less than 12 months 0   0   (2,000,000)
12 months or more $ 0   $ 0   $ (1,000,000)