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Reportable Operating Segments
 9 Months Ended
Sep. 30, 2020
Segment Reporting [Abstract]  
Reportable Operating Segments Reportable Operating Segments
Effective for the first quarter of 2020, we made certain enhancements to our transfer pricing methodology related to the sharing of revenues between our card issuing, network and merchant businesses, and our methodology related to the allocation of certain funding costs primarily related to our Card Member loan and Card Member receivable portfolios. These enhancements resulted in certain changes to Non-interest revenues, Interest expense and operating expenses across our reportable operating segments. Prior period amounts have been revised to conform to the current period presentation. These changes had no impact on our Consolidated Results of Operations.
The following table presents certain selected financial information for our reportable operating segments and Corporate & Other as of or for the three and nine months ended September 30:
Three Months Ended September 30, 2020 (Millions, except where indicated)GCSGGCSGMNS
Corporate & Other (a)
Consolidated
Total non-interest revenues$3,517 $2,327 $1,111 $(78)$6,877 
Revenue from contracts with customers (b)
2,364 1,969 1,053 (6)5,380 
Interest income1,916 351 4 53 2,324 
Interest expense242 139 (18)87 450 
Total revenues net of interest expense5,191 2,539 1,133 (112)8,751 
Net income (loss)$855 $220 $263 $(265)$1,073 
Total assets (billions)
$81 $40 $12 $54 $187 

Nine Months Ended September 30, 2020 (Millions, except where indicated)GCSGGCSGMNS
Corporate & Other (a)
Consolidated
Total non-interest revenues$10,343 $7,129 $3,376 $(200)$20,648 
Revenue from contracts with customers (b)
6,893 5,993 3,168 (21)16,033 
Interest income6,298 1,252 14 232 7,796 
Interest expense842 493 (60)433 1,708 
Total revenues net of interest expense15,799 7,888 3,450 (401)26,736 
Net income (loss)$1,583 $198 $746 $(830)$1,697 
Total assets (billions)
$81 $40 $12 $54 $187 

Three Months Ended September 30, 2019 (Millions, except where indicated)GCSGGCSGMNS
Corporate & Other (a)
Consolidated
Total non-interest revenues$4,226 $3,070 $1,471 $19 $8,786 
Revenue from contracts with customers (b)
3,047 2,668 1,337 (1)7,051 
Interest income2,402 485 6 187 3,080 
Interest expense437 262 (74)252 877 
Total revenues net of interest expense6,191 3,293 1,551 (46)10,989 
Net income (loss)$991 $568 $523 $(327)$1,755 
Total assets (billions)
$99 $54 $17 $24 $194 

Nine Months Ended September 30, 2019 (Millions, except where indicated)GCSGGCSGMNS
Corporate & Other (a)
Consolidated
Total non-interest revenues$12,331 $9,055 $4,398 $71 $25,855 
Revenue from contracts with customers (b)
8,931 7,874 4,017 5 20,827 
Interest income6,971 1,407 22 599 8,999 
Interest expense1,318 787 (241)799 2,663 
Total revenues net of interest expense17,984 9,675 4,661 (129)32,191 
Net income (loss)$2,826 $1,641 $1,658 $(1,059)$5,066 
Total assets (billions)
$99 $54 $17 $24 $194 
(a)Corporate & Other includes adjustments and eliminations for intersegment activity.
(b)Includes discount revenue, certain other fees and commissions and other revenues from customers.