Goodwill and Other Intangible Assets - Rollforward of Goodwill by Operating Segment (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 24,447	$ 24,154
Goodwill, Acquired During Period	1,724	450
Adjustments and other	(73)	(157)
Goodwill, Ending Balance	26,098	24,447
CB&W
Goodwill [Line Items]
Goodwill, Beginning Balance	15,841	14,040
Goodwill, Acquired During Period	1,168	0
Adjustments and other	(139)	1,801
Goodwill, Ending Balance	16,870	15,841
C&CB
Goodwill [Line Items]
Goodwill, Beginning Balance	6,167	8,125
Goodwill, Acquired During Period	0	0
Adjustments and other	(18)	(1,958)
Goodwill, Ending Balance	6,149	6,167
IH
Goodwill [Line Items]
Goodwill, Beginning Balance	2,439	1,989
Goodwill, Acquired During Period	556	450
Adjustments and other	84	0
Goodwill, Ending Balance	$ 3,079	$ 2,439

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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