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Retirement Benefits (Amounts Recorded in the Consolidated Statements of Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |
Compensation and benefits expense (Operating income) | $ (621) | $ (541) | $ (691) | $ (908) | $ (670) | $ (535) | $ (701) | $ (749) | $ (2,761) | $ (2,655) | $ (2,431)
Other net benefit (credits) cost |  |  |  |  |  |  |  |  | (215) | (201) | (233)
Pension Plan |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |
Compensation and benefits expense (Operating income) |  |  |  |  |  |  |  |  | 34 | 76 | 178
Other net benefit (credits) cost |  |  |  |  |  |  |  |  | (215) | (206) | (240)
Total (credit) cost |  |  |  |  |  |  |  |  | (181) | (130) | (62)
Postretirement Benefits |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |
Compensation and benefits expense (Operating income) |  |  |  |  |  |  |  |  | 1 | 1 | 2
Other net benefit (credits) cost |  |  |  |  |  |  |  |  | 0 | 5 | 7
Total (credit) cost |  |  |  |  |  |  |  |  | $ 1 | $ 6 | $ 9

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- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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