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Accounting Policies (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Retained earnings |  | $ (44,986) |  | $ (44,986) |  | $ (42,215)
Held-to-maturity securities, amortized cost |  | 1,441 |  | 1,441 |  | 17,661
Held-to-maturity securities, fair value |  | 1,615 |  | 1,615 |  | 18,044
Other comprehensive income (loss), before tax and net of reclassifications into Net income |  | 535 | $ 869 | 2,820 | $ 1,767 |
Available for sale debt securities, amortized cost |  | 93,661 |  | 93,661 |  | 67,790
Investment securities – available for sale |  | 97,052 |  | 97,052 |  | $ 69,163
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Retained earnings | $ 671 |  |  |  |  |
Accounting Standards Update 2019-04 | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Held-to-maturity securities, amortized cost | (16,200) |  |  |  |  |
Held-to-maturity securities, fair value | (16,500) |  |  |  |  |
Other comprehensive income (loss), before tax and net of reclassifications into Net income | 306 |  |  |  |  |
Available for sale debt securities, amortized cost | 16,200 |  |  |  |  |
Investment securities – available for sale | $ 16,500 |  |  |  |  |
Accounting Standards Update 2020-04 | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Held-to-maturity securities, amortized cost |  | (49) |  | (49) |  |
Held-to-maturity securities, fair value |  | (48) |  | (48) |  |
Available for sale debt securities, amortized cost |  | 49 |  | 49 |  |
Investment securities – available for sale |  | $ 48 |  | $ 48 |  |

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