Goodwill and Other Intangible Assets - Rollforward of Goodwill by Operating Segment (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Jun. 30, 2020	Dec. 31, 2019
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 24,154	$ 9,818
Goodwill, Acquired During Period	38	14,342
Adjustments	(310)	(6)
Goodwill, Ending Balance	23,882	24,154
CB&W
Goodwill [Line Items]
Goodwill, Beginning Balance	14,040	3,906
Goodwill, Acquired During Period	0	10,134
Adjustments	1,440	0
Goodwill, Ending Balance	15,480	14,040
C&CB
Goodwill [Line Items]
Goodwill, Beginning Balance	8,125	3,938
Goodwill, Acquired During Period	0	4,187
Adjustments	(1,750)	0
Goodwill, Ending Balance	6,375	8,125
IH
Goodwill [Line Items]
Goodwill, Beginning Balance	1,989	1,974
Goodwill, Acquired During Period	38	21
Adjustments	0	(6)
Goodwill, Ending Balance	$ 2,027	$ 1,989

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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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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