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Stock Repurchase Programs - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Sep. 26, 2017
Stock Repurchase Program [Abstract]
Stock repurchased and retired during period (in shares)	7,400,000	11,300,000	17,100,000
Stock repurchased and retired during period, cost	$ 1,439	$ 2,099	$ 2,781
New stock repurchase program (in shares)				50,000,000
Remaining number of shares authorized to be repurchased (in shares)	20,700,000

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Number of shares that have been repurchased and retired during the period.

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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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