Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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Stockholders' Equity (Narrative) (Details) - USD ($) shares in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Jul. 31, 2019
Stockholders Equity Note [Line Items]
Repurchases of capital stock	$ 8,496,000,000	$ 3,025,000,000
Class C Capital Stock \| Share Repurchase Program
Stockholders Equity Note [Line Items]
Authorized share repurchase amount			$ 25,000,000,000.0
Repurchases of capital stock (in shares)	6.5
Repurchases of capital stock	$ 8,500,000,000