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Operating Segments - Geographical Data (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Geographic Data
Revenues	$ 5,963	$ 5,833	$ 3,225	$ 8,269	$ 9,154	$ 7,886	$ 8,253	$ 8,375	$ 23,290	$ 33,669	$ 34,055
Long-Lived Assets	20,788				21,512				20,788	21,512
United States
Geographic Data
Revenues									17,942	27,162	28,362
Long-Lived Assets	16,896				17,577				16,896	17,577
Canada
Geographic Data
Revenues									5,348	6,507	$ 5,693
Long-Lived Assets	$ 3,892				$ 3,935				$ 3,892	$ 3,935

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Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

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