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Divestitures (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Aug. 31, 2018	Sep. 30, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Asset impairments			$ 136	$ 87	$ 95
Asset impairments			94
Impairment of held for use assets			$ 42
Brazilian Venture divestiture					$ 33
Disposal Group, Held-for-sale, Not Discontinued Operations | Brazilian Venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Asset impairments		$ 95
Impairment of intangible assets		42
Asset impairments		25
Impairment of held for use assets		28
Pre-tax (loss) gain on sale of businesses		(12)
Brazilian Venture divestiture		90
Increase to additional paid in capital from as a result of divestitures		$ 57
Loss on sale of business unit	$ 54
Goodwill written off during sale of business unit	$ 43
Banco Bradesco | Brazilian Venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Ownership percentage (percent)						100.00%

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