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Share Repurchase Program (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended		3 Months Ended			159 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Sep. 30, 2019	Mar. 31, 2019	Mar. 31, 2020	Dec. 31, 2019	Apr. 01, 2019
Shares Repurchased [Line Items]
BOD authorized									150,000,000
Stock repurchase program expiration date				Mar. 31, 2022
Aggregate cost				$ 2,956		$ 3,509	$ 39,700
Shares repurchased	[1]			14,305,793		18,149,450
Average purchase price	[1]			$ 178.66		$ 165.79
Remaining number of shares that may be repurchased under current authority		118,849,288		118,849,288			118,849,288
Treasury stock, value		$ 38,992		$ 38,992			$ 38,992	$ 36,424
Accelerated Share Repurchase Agreement [Member]
Shares Repurchased [Line Items]
Aggregate cost		$ 2,000	$ 2,500
Shares repurchased		8,786,380	11,795,930	8,786,380	3,172,900	11,795,930
Treasury stock, value		$ 1,600		$ 1,600			1,600
Paid-in capital, value		$ 400		$ 400			$ 400
[1] Includes 8,786,380 and 11,795,930 shares repurchased in February 2020 and 2019, respectively, under accelerated share repurchase programs.

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Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital.

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