Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Shareholder's Equity
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, authorized (in shares)	3,000,000	3,000,000
Common stock, issued (in shares)	1,500,000	1,500,000
Common stock, outstanding (in shares)	1,500,000	1,500,000
Accumulated other comprehensive loss:
Foreign currency translation adjustments, tax	$ 5	$ 25
Card Member Receivables [Member]
Assets
Financing receivables, reserves for credit losses	70	162
Card Member Loans [Member]
Assets
Financing receivables, reserves for credit losses	$ 20	$ 10