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Subsequent Event (Details) - USD ($) shares in Millions |  |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 12, 2019 | Feb. 07, 2019 | Jun. 20, 2016 | Mar. 10, 2016 | Mar. 08, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | [2] | Dec. 31, 2016 | [3] | Feb. 28, 2019 | Oct. 23, 2014
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accelerated share repurchases, authorized amount |  |  |  |  | $ 5,000,000,000 |  |  |  |  |  | $ 11,000,000,000
Accelerated share repurchases, cash paid |  |  |  | $ (5,000,000,000) |  |  |  |  |  |  |
Shares repurchased |  |  | 18 | 136 |  | 307 | [1] | 150 | 154 |  |
Accelerated share repurchase, percentage of agreement |  |  |  |  | 80.00% |  |  |  |  |  |
Amount of remaining shares authorized in stock purchase plan, value |  |  |  |  |  | $ 14,200,000,000 |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accelerated share repurchases, authorized amount |  | $ 6,800,000,000 |  |  |  |  |  |  |  |  |
Accelerated share repurchases, cash paid | $ 6,800,000,000 |  |  |  |  |  |  |  |  |  |
Shares repurchased | 130 |  |  |  |  |  |  |  |  |  |
Accelerated share repurchase, percentage of agreement |  | 80.00% |  |  |  |  |  |  |  |  |
Amount of remaining shares authorized in stock purchase plan, value |  |  |  |  |  |  |  |  |  | $ 5,300,000,000 |
[1] | Represents shares purchased pursuant to the accelerated share repurchase agreement with Citibank entered into on March 12, 2018, as well as other share repurchases. See above for additional information.
[2] | Represents shares purchased pursuant to the accelerated share repurchase agreement with Citibank entered into on February 2, 2017. See above for additional information.
[3] | Represents shares purchased pursuant to the accelerated share repurchase agreement entered into on March 8, 2016. See above for additional information.

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- Definition Accelerated Share Repurchases, Shares Repurchased During Period, Percentage of Agreement Amount + References No definition available. + Details
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- Definition Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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