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General Adoption of New Accounting Pronouncements (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax | $ (59,076) | $ (59,441) | $ (52,197) |
Retained Earnings [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax | $ (41,637) | (39,337) | $ (36,331) | $ (36,142)
Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax |  | $ 0 |  | $ 63

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