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Accounting Pronouncements (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Change in Accounting Estimate [Line Items] |  |
Retained earnings | $ 49,460 | $ 49,423
Cumulative Effect, Period of Adoption, Adjustment | ASU 2016-13 [Member] |  |
Change in Accounting Estimate [Line Items] |  |
Retained earnings |  | $ 59

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