Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Millions	Total	Preferred Stock [Member]	Common Stock [Member]	Share-Based Awards [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Stock Held in Treasury, at Cost [Member]
Beginning balance at Dec. 31, 2016		$ 11,203	$ 9	$ 3,914	$ 52,638	$ 89,039	$ (1,216)	$ (68,694)
Beginning balance (Accounting Standards Update 2016-09 [Member]) at Dec. 31, 2016				3,949		89,015
Repurchased	$ (6,721)							(6,721)
Issued		1,500	0
Redeemed		(850)
Cumulative effect of change in accounting principle for forfeiture of share-based awards | Accounting Standards Update 2016-09 [Member]				35
Cumulative effect of change in accounting principle for forfeiture of share-based awards, net of tax | Accounting Standards Update 2016-09 [Member]						(24)
Issuance and amortization of share-based awards				1,810
Delivery of common stock underlying share-based awards				(2,704)	2,934
Forfeiture of share-based awards				(89)
Exercise of share-based awards				(189)
Cancellation of share-based awards in satisfaction of withholding tax requirements					(2,220)
Preferred stock issuance costs, net of reversals upon redemption					8
Cash settlement of share-based awards					(3)
Net earnings	4,286					4,286
Dividends and dividend equivalents declared on common stock and share-based awards						(1,181)
Dividends declared on preferred stock	(587)					(587)
Preferred stock redemption premium						(14)
Other comprehensive income/(loss)	(664)						(664)
Reissued								34
Other								(11)
Ending balance at Dec. 31, 2017	82,243	11,853	9	2,777	53,357	91,519	(1,880)	(75,392)
Ending balance (Accounting Standards Update 2016-02 [Member]) at Dec. 31, 2017						91,466
Ending balance (Accounting Standards Update 2016-09 [Member]) at Dec. 31, 2017				2,777
Repurchased	(3,294)							(3,294)
Issued			0
Redeemed		(650)
Cumulative effect of change in accounting principle for revenue recognition from contracts with clients, net of tax | Accounting Standards Update 2014-09 [Member]						(53)
Issuance and amortization of share-based awards				1,355
Delivery of common stock underlying share-based awards				(1,175)	1,751
Forfeiture of share-based awards				(80)
Exercise of share-based awards				(32)
Cancellation of share-based awards in satisfaction of withholding tax requirements					(1,118)
Preferred stock issuance costs, net of reversals upon redemption					15
Net earnings	10,459					10,459
Dividends and dividend equivalents declared on common stock and share-based awards						(1,226)
Dividends declared on preferred stock	(584)					(584)
Preferred stock redemption premium						(15)
Other comprehensive income/(loss)	2,573						2,573
Reissued								21
Other								(5)
Ending balance at Dec. 31, 2018	90,185	11,203	9	2,845	54,005	100,100	693	(78,670)
Ending balance (Accounting Standards Update 2016-02 [Member]) at Dec. 31, 2018						100,112
Ending balance (Accounting Standards Update 2016-09 [Member]) at Dec. 31, 2018				2,845
Repurchased	(5,335)							(5,335)
Issued		1,100	0
Redeemed		(1,100)
Cumulative effect of change in accounting principle for forfeiture of share-based awards | Accounting Standards Update 2016-09 [Member]				0
Cumulative effect of change in accounting principle for leases, net of tax | Accounting Standards Update 2016-09 [Member]						12
Issuance and amortization of share-based awards				2,073
Delivery of common stock underlying share-based awards				(1,623)	1,617
Forfeiture of share-based awards				(100)
Cancellation of share-based awards in satisfaction of withholding tax requirements					(743)
Preferred stock issuance costs, net of reversals upon redemption					4
Net earnings	8,466					8,466
Dividends and dividend equivalents declared on common stock and share-based awards						(1,544)
Dividends declared on preferred stock	(560)					(560)
Preferred stock redemption premium						(9)
Other comprehensive income/(loss)	(2,177)						(2,177)
Reissued								12
Other								(13)
Ending balance at Dec. 31, 2019	$ 90,265	$ 11,203	$ 9	$ 3,195	$ 54,883	$ 106,465	$ (1,484)	$ (84,006)