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Investments (Fair Values by Contractual Maturity) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]    
Maturing in one year or less $ 12,941 $ 17,424
Maturing after one year through three years 4,855 3,356
Maturing after three years through five years 1,226 5,168
Maturing after five years through ten years 646 885
Mortgage- and asset-backed securities 559 1,891
Total interest-bearing securities $ 20,227 $ 28,724