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v3.19.3

Securities (Narrative) (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 21 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 USD ($) security | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) security | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) security
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items] |  |  |  |  |
Securities evaluated for other than temporary impairment | 25 |  | 25 |  | 25
Available-for-sale Securities, Gross Realized Gains | $ | $ 291 | $ 0 | $ 291 | $ 0 |
Available-for-sale Securities, Gross Realized Losses | $ |  |  |  |  | $ 0
Held-to-maturity securities sales | $ | $ 0 | $ 0 | $ 0 | $ 0 | $ 0
US Agency Obligations [Member] |  |  |  |  |
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items] |  |  |  |  |
Securities evaluated for other than temporary impairment | 21 |  | 21 |  | 21
Municipals [Member] |  |  |  |  |
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items] |  |  |  |  |
Securities evaluated for other than temporary impairment | 2 |  | 2 |  | 2
Corporates [Member] |  |  |  |  |
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items] |  |  |  |  |
Securities evaluated for other than temporary impairment | 2 |  | 2 |  | 2
S&P Rated AAA [Member] |  |  |  |  |
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items] |  |  |  |  |
Securities evaluated for other than temporary impairment | 2 |  | 2 |  | 2
S&P Rated AA [Member] |  |  |  |  |
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items] |  |  |  |  |
Securities evaluated for other than temporary impairment | 22 |  | 22 |  | 22
S&P Rated BBB+ [Member] |  |  |  |  |
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items] |  |  |  |  |
Securities evaluated for other than temporary impairment | 1 |  | 1 |  | 1

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