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v3.20.2

Securities (Narrative) (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) security | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) security | Jun. 30, 2019 USD ($)
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items] |  |  |  |
Securities evaluated for other than temporary impairment | 2 |  | 2 |
Available-for-sale Securities, Gross Realized Gains | $ | $ 213 | $ 0 | $ 644 | $ 0
Available-for-sale Securities, Gross Realized Losses | $ | 0 | 0 | 0 | 0
Held-to-maturity securities sales | $ | $ 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 | 1 |  | 1 |
Corporates [Member] |  |  |  |
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items] |  |  |  |
Securities evaluated for other than temporary impairment | 1 |  | 1 |
S&P Rated AAA [Member] |  |  |  |
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items] |  |  |  |
Securities evaluated for other than temporary impairment | 1 |  | 1 |
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 |

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