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Operating Segments - Geographic Data (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Geographic Data
Revenues	$ 9,154	$ 7,886	$ 8,253	$ 8,375	$ 8,786	$ 8,792	$ 8,080	$ 8,398	$ 33,669	$ 34,055	$ 26,223
Long-lived assets	21,500				19,427				21,500	19,427
UNITED STATES
Geographic Data
Revenues									27,162	28,362	21,443
Long-lived assets	17,565				15,885				17,565	15,885
CANADA
Geographic Data
Revenues									6,507	5,693	$ 4,780
Long-lived assets	$ 3,935				$ 3,542				$ 3,935	$ 3,542

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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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No definition available.

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