Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Cash and cash equivalents
Securities purchased under resale agreements	$ 87	$ 64
Card Member receivables, gross	57,413	55,893
Card Member receivables, reserves	619	573
Card Member loans	87,381	81,854
Card Member loans, reserves	2,383	2,134
Other loans, reserves	152	124
Premises and equipment, accumulated depreciation	6,562	6,015
Restricted cash	514	363
Liabilities
Long-term debt	$ 57,835	$ 58,423
Shareholders' Equity
Preferred shares, par value (in dollars per share)	$ 1.667	$ 1.667
Preferred shares, authorized (in shares)	20,000,000	20,000,000
Preferred shares, outstanding (in shares)	1,600	1,600
Preferred shares, issued (in shares)	1,600	1,600
Common shares, par value (in dollars per share)	$ 0.20	$ 0.20
Common shares, authorized (in shares)	3,600,000,000	3,600,000,000
Common shares, issued (in shares)	810,000,000	847,000,000
Common shares, outstanding (in shares)	810,000,000	847,000,000
Accumulated other comprehensive loss
Net unrealized debt securities gains (losses), tax	$ 11	$ (1)
Foreign currency translation adjustments, tax	(319)	(300)
Net unrealized pension and other postretirement benefits, tax	(208)	(170)
Variable Interest Entity, Primary Beneficiary [Member]
Cash and cash equivalents
Card Member receivables, gross	8,284	8,539
Card Member loans	32,230	33,194
Restricted cash	85	70
Liabilities
Long-term debt	$ 19,668	$ 19,509