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Earnings Per Common Share (EPS) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Basic and diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings allocated to participating share awards | $ (11)us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits | $ (11)us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits | $ (12)us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits | $ (12)us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits | $ (11)us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits | $ (12)us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits | $ (13)us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits | $ (11)us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits | $ (46)us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits |  | $ (47)us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits |  | $ (49)us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits |
Net income attributable to common shareholders |  |  |  |  |  |  |  |  | 5,839 axp_NetIncomeAttributableToCommonShareholders |  | 5,312 axp_NetIncomeAttributableToCommonShareholders |  | 4,433 axp_NetIncomeAttributableToCommonShareholders |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic: Weighted-average common stock |  |  |  |  |  |  |  |  | 1,045,000,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 1,082,000,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 1,135,000,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
Add: Weighted-average stock options |  |  |  |  |  |  |  |  | 6,000,000 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants |  | 7,000,000 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants |  | 6,000,000 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants |
Diluted |  |  |  |  |  |  |  |  | 1,051,000,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 1,089,000,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 1,141,000,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
Basic EPS: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  | $ 5.58 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | [1] | $ 4.91 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | [1] | $ 3.91 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | [1]
Diluted |  |  |  |  |  |  |  |  | $ 5.56 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare |  | $ 4.88 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare |  | $ 3.89 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare |
Net income attributable to common shareholders | $ 1.4 us-gaap_EarningsPerShareBasic | $ 1.41 us-gaap_EarningsPerShareBasic | $ 1.44 us-gaap_EarningsPerShareBasic | $ 1.34 us-gaap_EarningsPerShareBasic | $ 1.22 us-gaap_EarningsPerShareBasic | $ 1.26 us-gaap_EarningsPerShareBasic | $ 1.28 us-gaap_EarningsPerShareBasic | $ 1.15 us-gaap_EarningsPerShareBasic |  |  |  |  |  |
Diluted EPS: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted |  |  |  |  |  |  |  |  | $ 5.56 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare |  | $ 4.88 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare |  | $ 3.89 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare |
Net income attributable to common shareholders | $ 1.39 us-gaap_EarningsPerShareDiluted | $ 1.4 us-gaap_EarningsPerShareDiluted | $ 1.43 us-gaap_EarningsPerShareDiluted | $ 1.33 us-gaap_EarningsPerShareDiluted | $ 1.21 us-gaap_EarningsPerShareDiluted | $ 1.25 us-gaap_EarningsPerShareDiluted | $ 1.27 us-gaap_EarningsPerShareDiluted | $ 1.15 us-gaap_EarningsPerShareDiluted |  |  |  |  |  |
Earnings Per Common Share (Textuals) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subordinated debentures | $ 750 us-gaap_ConvertibleSubordinatedDebt |  |  |  | $ 750 us-gaap_ConvertibleSubordinatedDebt |  |  |  | $ 750 us-gaap_ConvertibleSubordinatedDebt |  | $ 750 us-gaap_ConvertibleSubordinatedDebt |  | $ 750 us-gaap_ConvertibleSubordinatedDebt |
Stock Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per Share, amount |  |  |  |  |  |  |  |  | 200,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember |  | 100,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember |  | 7,600,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember |
[1] | Represents net income less earnings allocated to participating share awards of $46 million, $47 million and $49 million for the years ended December 31, 2014, 2013 and 2012, respectively.

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