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Contingencies and Certain Commitments (Details) - USD ($) $ / shares in Units, shares in Millions | Sep. 07, 2018 | Mar. 14, 2018 | Mar. 12, 2018 | Sep. 30, 2018 | Apr. 30, 2018
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Commitments and Contingencies Disclosure [Abstract] |  |  |  |  |
Share repurchase agreement, amount |  |  | $ 4,000,000,000 |  |
Accelerated share repurchases, cash paid |  | $ 4,000,000,000 |  |  |
Shares repurchased | 21 | 87 |  |  |
Accelerated share repurchase, average price paid for all shares delivered (in dollars per share) | $ 36.86 |  |  |  |
Shares repurchased, price per share (in dollars per share) |  | $ 36.61 |  |  |
Shares received in initial delivery, percentage of agreement amount |  |  | 80.00% |  |
Remaining authorized repurchase amount |  |  |  | $ 9,200,000,000 |
Office Building In Hudson Yards Neighborhood Of New York City [Member] |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Term of corporate headquarters lease agreement |  |  |  |  | 20 years
Future minimum commitment for corporate headquarters lease |  |  |  |  | $ 1,700,000,000

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- Definition Final price paid per share for the purchase of the targeted number of shares, determined by an average market price over a fixed period of time. + 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 The price paid per share to immediately purchase the targeted number of shares on the date of executing 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 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 Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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