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Compensation and Benefit Plans (Plan Assets - Changes in Level 3 Fair Value) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Pension Plans |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | $ 3,454 | $ 3,477
Actual return on plan assets: |  |
Fair value of plan assets at end of year | 3,298 | 3,454
Pension Plans | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 289 | 390
Actual return on plan assets: |  |
Relating to assets still held at end of period | 47 | 114
Relating to assets sold during the period | (17) | (44)
Purchases | 38 | 13
Dispositions | (143) | (184)
Transfers in and/or out of Level 3 | 0 | 0
Fair value of plan assets at end of year | 214 | 289
Postretirement Benefits Other Than Pensions |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 2,086 | 2,065
Actual return on plan assets: |  |
Fair value of plan assets at end of year | 2,036 | 2,086
Postretirement Benefits Other Than Pensions | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 105 | 164
Actual return on plan assets: |  |
Relating to assets still held at end of period | (6) | 18
Relating to assets sold during the period | 15 | (1)
Purchases | 7 | 9
Dispositions | (47) | (85)
Transfers in and/or out of Level 3 | 0 | 0
Fair value of plan assets at end of year | $ 74 | $ 105

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- Definition Actual return on plan assets, separately identifying the amount related to assets sold during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920 + Details
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- Definition Actual return on plan assets, separately identifying the amount related to assets still held at the reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition The amount of decrease in the plan assets attributed to the sale, liquidation, spin-off or other divestiture of a corporate division or subsidiary. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(7) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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