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Share Repurchase Program (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended						4 Months Ended	6 Months Ended		162 Months Ended
	Mar. 31, 2019	Mar. 31, 2020		Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019		Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 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					$ 639				$ 2,956	$ 4,148	$ 39,700
Shares repurchased		14,305,793	[1]		3,732,974	18,149,450	[1]		14,305,793	21,882,424
Average purchase price		$ 178.66	[1]		$ 171.24	$ 165.79	[1]		$ 178.66	$ 166.72
Remaining number of shares that may be repurchased under current authority								118,849,288	118,849,288		118,849,288
Treasury stock, value								$ 38,984	$ 38,984		$ 38,984	$ 36,424
Accelerated Share Repurchase Agreement [Member]
Shares Repurchased [Line Items]
Aggregate cost	$ 2,500							$ 2,000
Shares repurchased	11,795,930	8,786,380		3,172,900		11,795,930		8,786,380
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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