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Accounting Changes - Credit Losses (Details) - USD ($) $ in Millions	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Accounting Changes
Deferred tax assets	$ 8,782		$ 5,182
Retained earnings	$ 162,626		$ 162,954
Accounting Standards Update 2016-13 \| Adjustment
Accounting Changes
Allowance for credit losses		$ 81
Deferred tax assets		(14)
Retained earnings		$ (66)