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Investments (HTM Contractual Maturity) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 2,254 $ 2,370
Fair Value 2,346 2,439
Mortgage-backed securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 1,659 1,765
Fair Value 1,654 1,762
Non-mortgage-backed securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost 0 0
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value 0 0
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Amortized Cost 0 0
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value 0 0
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Amortized Cost 411 412
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Fair Value 457 446
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost 184 193
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value 235 231
Amortized Cost 595 605
Fair Value $ 692 $ 677