Consolidated Statements of Income and Retained Earnings - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues
Discount revenue earned from purchased Card Member receivables and loans	$ 248	$ 174	$ 462	$ 359
Interest income from affiliates and other	90	68	179	123
Finance revenue	13	11	28	23
Total revenues	351	253	669	505
Expenses
Provisions for losses	58	54	122	116
Interest expense	173	123	304	220
Interest expense to affiliates	40	13	69	22
Other, net	(13)	11	(27)	29
Total expenses	258	201	468	387
Pretax income	93	52	201	118
Income tax provision (benefit)	5	(5)	(16)	2
Net income	88	57	217	116
Retained earnings at beginning of period	2,837	3,370	2,708	3,311
Retained earnings at end of period	$ 2,925	$ 3,427	$ 2,925	$ 3,427