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Investments in Equity Securities (Investment in ABI Narrative) (Details) - ABI [Member] - USD ($) shares in Millions | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019 | Mar. 31, 2020
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 10.00% |  | 10.10%
Number of restricted shares owned (in shares) | 185 |  |
Number of ordinary shares owned (in shares) | 12 |  |
Investments in equity securities | $ 16,716,000,000 | $ 18,071,000,000 |
Difference between carrying amount and fair value, percentage (approximately) | 36.00% | 11.00% |
Equity method investment, impairment | $ 0 | $ 0 |
Fair Value, Inputs, Level 1 [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Fair value of equity investment | $ 10,700,000,000 | $ 16,100,000,000 |

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