Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - 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, 2018		$ 11,203	$ 9	$ 2,845	$ 54,005	$ 100,100	$ 693	$ (78,670)
Beginning balance (Accounting Standards Update 2016-02 [Member]) at Dec. 31, 2018						100,112
Issued		0	0
Redeemed		0
Issuance and amortization of share-based awards				1,506
Delivery of common stock underlying share-based awards				(1,596)	1,587
Forfeiture of share-based awards				(16)
Cancellation of share-based awards in satisfaction of withholding tax requirements					(730)
Current expected credit losses, net of tax | Accounting Standards Update 2016-13 [Member]						0
Leases, net of tax | Accounting Standards Update 2016-02 [Member]						12
Other comprehensive income/(loss)	$ (1,306)						(1,306)
Repurchased	(1,250)							(1,250)
Reissued								11
Other								(6)
Net earnings	2,251					2,251
Dividends and dividend equivalents declared on common stock and share-based awards						(306)
Dividends declared on preferred stock	(69)					(69)
Preferred stock redemption premium						0
Ending balance at Mar. 31, 2019	90,273	11,203	9	2,739	54,862	101,988	(613)	(79,915)
Beginning balance at Dec. 31, 2018		11,203	9	2,845	54,005	100,100	693	(78,670)
Beginning balance (Accounting Standards Update 2016-02 [Member]) at Dec. 31, 2018						100,112
Ending balance at Dec. 31, 2019	90,265	11,203	9	3,195	54,883	106,465	(1,484)	(84,006)
Ending balance (Accounting Standards Update 2016-02 [Member]) at Dec. 31, 2019						105,827
Issued		350	0
Redeemed		(350)
Issuance and amortization of share-based awards				1,397
Delivery of common stock underlying share-based awards				(1,547)	1,541
Forfeiture of share-based awards				(8)
Cancellation of share-based awards in satisfaction of withholding tax requirements					(803)
Current expected credit losses, net of tax | Accounting Standards Update 2016-13 [Member]						(638)
Leases, net of tax | Accounting Standards Update 2016-02 [Member]						0
Other comprehensive income/(loss)	3,421						3,421
Repurchased	(1,928)							(1,928)
Reissued								10
Other								(5)
Net earnings	1,213					1,213
Dividends and dividend equivalents declared on common stock and share-based awards						(449)
Dividends declared on preferred stock	(89)					(89)
Preferred stock redemption premium						(1)
Ending balance at Mar. 31, 2020	$ 92,379	$ 11,203	$ 9	$ 3,037	$ 55,621	$ 106,501	$ 1,937	$ (85,929)