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Investments in Equity Securities (Investment in ABI Narrative) (Details) - ABI [Member] shares in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) | Mar. 31, 2020 € / shares | Dec. 31, 2019 € / shares
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 10.10% |  |  |
Number of restricted shares owned (in shares) | shares | 185 |  |  |
Number of ordinary shares owned (in shares) | shares | 12 |  |  |
Investments in equity securities | $ | $ 18,453,000,000 | $ 18,071,000,000 |  |
Difference between carrying amount and fair value, percentage (approximately) | 52.00% | 11.00% |  |
Equity method investment, impairment | $ | $ 0 | $ 0 |  |
Derivative instrument, number of shares hedged (in shares) | shares | 100 |  |  |
Derivative instrument, shares hedged, price per share (in eur per share) | € / shares |  |  | € 40.47 | € 72.71
Fair Value, Inputs, Level 1 [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of equity investment | $ | $ 8,800,000,000 | $ 16,100,000,000 |  |

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