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Shareholders' Equity Share Repurchases (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Stockholders' Equity [Abstract]
Common shares repurchases, shares	14,000,000	22,000,000
Common share repurchases, average price per share	$ 300.58	$ 245.97
Common share repurchases	$ 4,250	$ 5,500	$ 4,500
Board authorized shares remaining	58,000,000	72,000,000

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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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Total cost of shares repurchased divided by the total number of shares repurchased.

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