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Investment Securities - Contractual Maturities of AFS Investment Securities (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Fixed maturities, excluding mortgage-backed, asset-backed, and collateralized securities:    
Due in 1 year or less $ 184  
Due after 1 year through 5 years 526  
Due after 5 years through 10 years 410  
Due after 10 years 194  
Mortgage-backed, asset-backed, and collateralized securities 293  
Total 1,607 $ 1,578
Fixed maturities, excluding mortgage-backed, asset-backed, and collateralized securities:    
Due in 1 year or less 184  
Due after 1 year through 5 years 534  
Due after 5 years through 10 years 421  
Due after 10 years 208  
Mortgage-backed, asset-backed, and collateralized securities 296  
Cost/ Amortized Cost $ 1,643 $ 1,574