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