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Reserves for Losses (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Changes in the Card Member loans reserve for losses [Line Items] |  |  |  |
Balance, January 1 |  |  | $ 2,134 | $ 1,706
Provisions | $ 603 | $ 528 | 1,128 | 1,027
Net write-offs Principal, interest and fees |  |  | (254) | (217)
Other |  |  | 12 | 2
Ending Balance | $ 2,168 | $ 1,840 | 2,168 | 1,840
Net Write Offs [Member] |  |  |  |
Changes in the Card Member loans reserve for losses [Line Items] |  |  |  |
Provisions |  |  | 1,128 | 1,027
Provisions for loans and lease losses deductions net write offs principal |  |  |  |
Changes in the Card Member loans reserve for losses [Line Items] |  |  |  |
Net write-offs Principal, interest and fees |  |  | (920) | (747)
Provisions for loans and lease losses deductions net write offs interest and fees |  |  |  |
Changes in the Card Member loans reserve for losses [Line Items] |  |  |  |
Net write-offs Principal, interest and fees |  |  | (186) | (148)
Troubled Debt Restructuring [Member] |  |  |  |
Changes in the Card Member loans reserve for losses [Line Items] |  |  |  |
Net write-offs Principal, interest and fees |  |  | (33) | (14)
Foreign Currency Translation Adjustments [Member] |  |  |  |
Changes in the Card Member loans reserve for losses [Line Items] |  |  |  |
Other |  |  | 3 | (5)
Other Items [Member] |  |  |  |
Changes in the Card Member loans reserve for losses [Line Items] |  |  |  |
Other |  |  | $ 9 | $ 7

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- Definition Amount of other addition (reduction) in allowance reserve for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5212-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
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