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Parent Company (Details 2) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash Flows from Operating Activities                      
Net income $ (1,197) $ 1,356 $ 1,340 $ 1,237 $ 825 $ 1,142 $ 2,015 $ 1,426 $ 2,736 $ 5,408 $ 5,163
Adjustments to reconcile income from continuing operations to net cash provided by operating activities:                      
Gain on sale of securities                 0 0 0
Premium paid on debt exchange                 0 0 0
Net cash provided by operating activities                 13,540 8,291 10,706
Cash Flows from Investing Activities                      
Purchase of investments                 (2,612) (2,162) (1,713)
Purchase of premises and equipment                 (1,062) (1,375) (1,341)
Net cash (used in) provided by investing activities                 (18,273) 1,868 (8,193)
Cash Flows from Financing Activities                      
Proceeds from long-term borrowings                 32,764 8,824 9,923
Principal payments on long term debt                 (24,082) (9,848) (19,246)
Issuance of American Express preferred shares                 0 0 841
Issuance of American Express common shares and other                 129 177 193
Repurchase of American Express common shares                 (4,300) (4,400) (4,500)
Dividends paid                 (1,251) (1,207) (1,172)
Net cash provided by (used in) financing activities                 12,245 (7,599) (1,763)
Net increase (decrease) in cash and cash equivalents                 7,719 2,446 474
Cash and cash equivalents at beginning of year       25,208       22,762 25,208 22,762 22,288
Cash and cash equivalents at end of year 32,927       25,208       32,927 25,208 22,762
Parent Company [Member]                      
Cash Flows from Operating Activities                      
Net income                 2,736 5,408 5,163
Adjustments to reconcile income from continuing operations to net cash provided by operating activities:                      
Equity in net income of subsidiaries and affiliates                 (3,174) (5,903) (5,633)
Dividends received from subsidiaries and affiliates                 5,755 4,999 5,331
Gain on sale of securities                 0 0 0
Other operating activities, primarily with subsidiaries and affiliates                 659 (102) 332
Premium paid on debt exchange                 0 0 0
Net cash provided by operating activities                 5,976 4,402 5,193
Cash Flows from Investing Activities                      
Purchase of investments                 0 0 3
Purchase of premises and equipment                 0 (1) (29)
Loans to subsidiaries and affiliates                 (4,044) 4,142 (3,952)
Investments in subsidiaries and affiliates                 0 (25) 0
Net cash (used in) provided by investing activities                 (4,044) 4,116 (3,984)
Cash Flows from Financing Activities                      
Proceeds from long-term borrowings                 5,900 0 0
Principal payments on long term debt                 (1,500) (1,350) 0
Short-term debt of subsidiaries and affiliates                 (1,313) (2,879) 986
Issuance of American Express preferred shares                 0 0 841
Issuance of American Express common shares and other                 129 176 192
Repurchase of American Express common shares                 (4,400) (4,430) (4,480)
Dividends paid                 (1,251) (1,206) (1,172)
Net cash provided by (used in) financing activities                 (2,435) (9,689) (3,633)
Net increase (decrease) in cash and cash equivalents                 (503) (1,171) (2,424)
Cash and cash equivalents at beginning of year       $ 5,229       $ 6,400 5,229 6,400 8,824
Cash and cash equivalents at end of year $ 4,726       $ 5,229       $ 4,726 $ 5,229 $ 6,400