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Earnings Per Share - Calculation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Net income	$ 958	$ 819	$ 703	$ 753	$ 819	$ 673	$ 2,480	$ 2,245
Dividend equivalent payments, basic	0			(1)			(1)	(2)
Dividend equivalent payments, diluted	0			0			(1)	0
Income available to common stockholders, basic	958			752			2,479	2,243
Income available to common stockholders, diluted	$ 958			$ 753			$ 2,479	$ 2,245
Weighted-average shares outstanding (in shares)	233.2			245.3			236.4	248.5
Dilutive effect of outstanding options and share-settled awards (in shares)	0.8			1.1			0.8	1.2
Adjusted weighted-average shares outstanding (in shares)	234.0			246.4			237.2	249.7
Basic (in dollars per share)	$ 4.11			$ 3.07			$ 10.49	$ 9.03
Diluted (in dollars per share)	$ 4.10			$ 3.06			$ 10.45	$ 8.99

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