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Net value of common stock activity during the period, including activity related to share issuances, exercises of options, emloyee stock purchase plan activity and other activity.

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Par value less than $.5 million at each date

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Treasury Stock Shares Net Acquired Reissued

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash.

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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The amount of accretion of the preferred stock redemption discount during the period.

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Total Equity and Other Comprehensive Income (Rollforward of Total Equity) (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jan. 01, 2020	Dec. 31, 2019	Mar. 31, 2019	Jan. 01, 2019
Common Stock [Abstract]
Equity, Beginning Balance	$ 49,290.0		$ 49,343.0	$ 47,770.0
Adjusted opening balance					$ 48,672.0		$ 48,575.0	$ 47,832.0
Net income	3,655.0	$ 1,374.0	4,570.0	2,645.0
Other comprehensive income (loss), net of tax	551.0	636.0	2,270.0	1,356.0
Dividends, Cash [Abstract]
Common	(491.0)	(432.0)	(994.0)	(868.0)
Preferred	(55.0)	(55.0)	(118.0)	(118.0)
Common stock activity	11.0	10.0	11.0	10.0
Treasury stock activity	14.0	(782.0)	(1,296.0)	(1,403.0)
Other	(27.0)	55.0	(167.0)	(73.0)
Equity, Ending Balance	52,948.0	49,381.0	52,948.0	49,381.0
Preferred stock (less than)	$ 0.5	$ 0.5	$ 0.5	$ 0.5		$ 0.5
Accounting Standards Update 2016-02
Common Stock [Abstract]
Cumulative effect of new accounting principle in period of adoption								62.0
Accounting Standards Update 2016-13
Common Stock [Abstract]
Cumulative effect of new accounting principle in period of adoption					(671.0)
Common Stock, par value $5.00
Common Stock [Abstract]
Beginning Balance (in shares)	424	452	433	457
Treasury stock activity, shares	1	(5)	(8)	(10)
Ending Balance, (in shares)	425	447	425	447
Equity, Beginning Balance	$ 2,712.0		$ 2,712.0	$ 2,711.0
Adjusted opening balance					2,712.0		2,711.0	2,711.0
Dividends, Cash [Abstract]
Equity, Ending Balance	2,712.0	$ 2,711.0	2,712.0	2,711.0
Capital Surplus - Preferred Stock [Member]
Common Stock [Abstract]
Equity, Beginning Balance	3,994.0		3,993.0	3,986.0
Adjusted opening balance					3,993.0		3,990.0	3,986.0
Dividends, Cash [Abstract]
Preferred stock discount accretion	1.0	1.0	2.0	2.0
Other				3.0
Equity, Ending Balance	3,995.0	3,991.0	3,995.0	3,991.0
Capital Surplus - Common Stock and Other [Member]
Common Stock [Abstract]
Equity, Beginning Balance	12,294.0		12,376.0	12,291.0
Adjusted opening balance					12,376.0		12,183.0	12,291.0
Dividends, Cash [Abstract]
Common stock activity	11.0	10.0	11.0	10.0
Treasury stock activity	2.0	(1.0)	51.0	9.0
Other	(18.0)	65.0	(149.0)	(53.0)
Equity, Ending Balance	12,289.0	12,257.0	12,289.0	12,257.0
Retained Earnings [Member]
Common Stock [Abstract]
Equity, Beginning Balance	41,885.0		42,215.0	38,919.0
Adjusted opening balance					41,544.0		39,742.0	38,981.0
Net income	3,648.0	1,362.0	4,556.0	2,623.0
Dividends, Cash [Abstract]
Common	(491.0)	(432.0)	(994.0)	(868.0)
Preferred	(55.0)	(55.0)	(118.0)	(118.0)
Preferred stock discount accretion	(1.0)	(1.0)	(2.0)	(2.0)
Equity, Ending Balance	44,986.0	40,616.0	44,986.0	40,616.0
Retained Earnings [Member] \| Accounting Standards Update 2016-02
Common Stock [Abstract]
Cumulative effect of new accounting principle in period of adoption								62.0
Retained Earnings [Member] \| Accounting Standards Update 2016-13
Common Stock [Abstract]
Cumulative effect of new accounting principle in period of adoption					(671.0)
Accumulated Other Comprehensive Income (Loss) [Member]
Common Stock [Abstract]
Equity, Beginning Balance	2,518.0		799.0	(725.0)
Adjusted opening balance					799.0		(5.0)	(725.0)
Other comprehensive income (loss), net of tax	551.0	636.0	2,270.0	1,356.0
Dividends, Cash [Abstract]
Equity, Ending Balance	3,069.0	631.0	3,069.0	631.0
Treasury Stock [Member]
Common Stock [Abstract]
Equity, Beginning Balance	(14,140.0)		(12,781.0)	(9,454.0)
Adjusted opening balance					(12,781.0)		(10,085.0)	(9,454.0)
Dividends, Cash [Abstract]
Treasury stock activity	12.0	(781.0)	(1,347.0)	(1,412.0)
Equity, Ending Balance	(14,128.0)	(10,866.0)	(14,128.0)	(10,866.0)
Noncontrolling Interest [Member]
Common Stock [Abstract]
Equity, Beginning Balance	27.0		29.0	42.0
Adjusted opening balance					$ 29.0		$ 39.0	$ 42.0
Net income	7.0	12.0	14.0	22.0
Dividends, Cash [Abstract]
Other	(9.0)	(10.0)	(18.0)	(23.0)
Equity, Ending Balance	$ 25.0	$ 41.0	$ 25.0	$ 41.0