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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018		Dec. 31, 2017
Earnings Per Share [Abstract]
Earnings available to common stockholders									$ 3,009	$ 2,122		$ 2,143
Basic weighted-average shares outstanding (in shares)									258.8	275.5		302.7
Effect of employee stock awards (in shares)									1.1	1.2		0.9
Diluted weighted-average shares outstanding (in shares)									259.9	276.7		303.6
Earnings per share, basic (in dollars per share)	$ 2.54	$ 4.01	$ 4.03	$ 1.09	$ 1.70	$ 3.06	$ 2.48	$ 0.51	$ 11.63	$ 7.70	[1]	$ 7.08	[1]
Earnings per share, diluted (in dollars per share)	$ 2.53	$ 3.99	$ 4.02	$ 1.09	$ 1.69	$ 3.05	$ 2.48	$ 0.51	$ 11.58	$ 7.67	[1]	$ 7.06	[1]
[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.

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