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Investments in Equity Securities (Investment in ABI Narrative) (Details) - ABI [Member] - USD ($) shares in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment, ownership percentage | 10.00% |
Number of restricted shares owned (in shares) | 185 |
Number of ordinary shares owned (in shares) | 12 |
Restricted shares, lock-up period | 5 years |
Investments in equity securities | $ 17,390,000,000 | $ 16,651,000,000
Difference between carrying amount and fair value, percentage (approximately) | 28.00% | 17.00%
Equity method investment, impairment | $ 0 | $ 0
Fair Value, Inputs, Level 1 [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair value of equity investment | $ 12,400,000,000 | $ 13,800,000,000

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