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Employee Benefit Plans (Pension Plans) (Fair Value Tables) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets |  | $ 30,555 |  |  |
Ending Balance, Plan Assets |  | 35,689 |  | $ 30,555 |
Not Subject to Leveling [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets |  | 13,570 |  |  |
Ending Balance, Plan Assets |  | 15,691 |  | 13,570 |
Quoted price in active markets (Level 1) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets |  | 5,210 |  |  |
Ending Balance, Plan Assets |  | 4,787 |  | 5,210 |
Significant other observable inputs (Level 2) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets |  | 9,936 |  |  |
Ending Balance, Plan Assets |  | 13,285 |  | 9,936 |
Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets |  | 1,407 |  | 1,347 |
Realized gains (losses) |  | 92 |  | 65 |
Unrealized gains relating to instruments still held in the reporting period |  | (30) |  | 23 |
Purchases, sales and settlements, net |  | 23 |  | (28) |
Ending Balance, Plan Assets |  | 1,492 |  | 1,407 |
Global Equities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets |  | 4,685 |  |  |
Ending Balance, Plan Assets |  | 3,132 |  | 4,685 |
Global Equities [Member] | Not Subject to Leveling [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets |  | 0 |  |  |
Ending Balance, Plan Assets |  | 0 |  | 0 |
Global Equities [Member] | Quoted price in active markets (Level 1) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets |  | 4,682 |  |  |
Ending Balance, Plan Assets |  | 3,129 |  | 4,682 |
Global Equities [Member] | Significant other observable inputs (Level 2) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets |  | 3 |  |  |
Ending Balance, Plan Assets |  | 3 |  | 3 |
Global Equities [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets |  | 0 |  |  |
Ending Balance, Plan Assets |  | 0 |  | 0 |
Global Equity Commingled Funds [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets | [1] | 367 |  |  |
Ending Balance, Plan Assets | [1] | 1,084 |  | 367 |
Global Equity Commingled Funds [Member] | Not Subject to Leveling [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets | [1] | 0 |  |  |
Ending Balance, Plan Assets | [1] | 0 |  | 0 |
Global Equity Commingled Funds [Member] | Quoted price in active markets (Level 1) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets | [1] | 0 |  |  |
Ending Balance, Plan Assets | [1] | 0 |  | 0 |
Global Equity Commingled Funds [Member] | Significant other observable inputs (Level 2) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets | [1] | 367 |  |  |
Ending Balance, Plan Assets | [1] | 1,084 |  | 367 |
Global Equity Commingled Funds [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets | [1] | 0 |  |  |
Ending Balance, Plan Assets | [1] | 0 |  | 0 |
Enhanced Global Equities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets | [2] | 1,662 |  |  |
Ending Balance, Plan Assets | [2] | 1,032 |  | 1,662 |
Enhanced Global Equities [Member] | Not Subject to Leveling [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets | [2] | 0 |  |  |
Ending Balance, Plan Assets |  | 0 |  | 0 | [2]
Enhanced Global Equities [Member] | Quoted price in active markets (Level 1) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets | [2] | 168 |  |  |
Ending Balance, Plan Assets | [2] | 213 |  | 168 |
Enhanced Global Equities [Member] | Significant other observable inputs (Level 2) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets | [2] | 1,494 |  |  |
Ending Balance, Plan Assets | [2] | 819 |  | 1,494 |
Enhanced Global Equities [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets | [2] | 0 |  |  |
Ending Balance, Plan Assets | [2] | 0 |  | 0 |
Global Equity Funds at net asset value [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets | [3] | 7,090 |  |  |
Ending Balance, Plan Assets | [3] | 7,599 |  | 7,090 |
Global Equity Funds at net asset value [Member] | Not Subject to Leveling [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets | [3] | 7,090 |  |  |
Ending Balance, Plan Assets | [3] | 7,599 |  | 7,090 |
Global Equity Funds at net asset value [Member] | Quoted price in active markets (Level 1) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets | [3] | 0 |  |  |
Ending Balance, Plan Assets | [3] | 0 |  | 0 |
Global Equity Funds at net asset value [Member] | Significant other observable inputs (Level 2) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets | [3] | 0 |  |  |
Ending Balance, Plan Assets | [3] | 0 |  | 0 |
Global Equity Funds at net asset value [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets | [3] | 0 |  |  |
Ending Balance, Plan Assets | [3] | 0 |  | 0 |
Private Equities |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets |  | 1,361 |  |  |
Ending Balance, Plan Assets |  | 1,216 | [3],[4] | 1,361 |
Private Equities | Not Subject to Leveling [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets | [3],[4] | 1,239 |  |  |
Ending Balance, Plan Assets | [3],[4] | 1,170 |  | 1,239 |
Private Equities | Quoted price in active markets (Level 1) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets | [3],[4] | 0 |  |  |
Ending Balance, Plan Assets | [3],[4] | 0 |  | 0 |
Private Equities | Significant other observable inputs (Level 2) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets | [3],[4] | 0 |  |  |
Ending Balance, Plan Assets | [3],[4] | 0 |  | 0 |
Private Equities | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets |  | 122 | [3],[4] | 182 |
Realized gains (losses) |  | 61 |  | 46 |
Unrealized gains relating to instruments still held in the reporting period |  | (47) |  | 5 |
Purchases, sales and settlements, net |  | (90) |  | (111) |
Ending Balance, Plan Assets |  | 46 |  | 122 | [3],[4]
Governments [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets |  | 314 |  |  |
Ending Balance, Plan Assets |  | 1,514 |  | 314 |
Governments [Member] | Not Subject to Leveling [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets |  | 0 |  |  |
Ending Balance, Plan Assets |  | 0 |  | 0 |
Governments [Member] | Quoted price in active markets (Level 1) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets |  | 260 |  |  |
Ending Balance, Plan Assets |  | 1,445 |  | 260 |
Governments [Member] | Significant other observable inputs (Level 2) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets |  | 54 |  |  |
Ending Balance, Plan Assets |  | 69 |  | 54 |
Governments [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets |  | 0 |  |  |
Ending Balance, Plan Assets |  | 0 |  | 0 |
Corporate Bonds [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets |  | 7,637 |  |  |
Ending Balance, Plan Assets |  | 10,929 |  | 7,637 |
Corporate Bonds [Member] | Not Subject to Leveling [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets |  | 0 |  |  |
Ending Balance, Plan Assets |  | 0 |  | 0 |
Corporate Bonds [Member] | Quoted price in active markets (Level 1) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets |  | 0 |  |  |
Ending Balance, Plan Assets |  | 0 |  | 0 |
Corporate Bonds [Member] | Significant other observable inputs (Level 2) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets |  | 7,637 |  |  |
Ending Balance, Plan Assets |  | 10,929 |  | 7,637 |
Corporate Bonds [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets |  | 0 |  |  |
Ending Balance, Plan Assets |  | 0 |  | 0 |
Fixed Income Securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets | [3] | 2,788 |  |  |
Ending Balance, Plan Assets | [3] | 3,519 |  | 2,788 |
Fixed Income Securities [Member] | Not Subject to Leveling [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets | [3] | 2,788 |  |  |
Ending Balance, Plan Assets | [3] | 3,519 |  | 2,788 |
Fixed Income Securities [Member] | Quoted price in active markets (Level 1) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets | [3] | 0 |  |  |
Ending Balance, Plan Assets | [3] | 0 |  | 0 |
Fixed Income Securities [Member] | Significant other observable inputs (Level 2) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets | [3] | 0 |  |  |
Ending Balance, Plan Assets | [3] | 0 |  | 0 |
Fixed Income Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets | [3] | 0 |  |  |
Ending Balance, Plan Assets | [3] | 0 |  | 0 |
Real Estate [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets |  | 1,815 |  |  |
Ending Balance, Plan Assets |  | 1,857 | [3],[5] | 1,815 |
Real Estate [Member] | Not Subject to Leveling [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets | [3],[5] | 513 |  |  |
Ending Balance, Plan Assets | [3],[5] | 396 |  | 513 |
Real Estate [Member] | Quoted price in active markets (Level 1) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets | [3],[5] | 0 |  |  |
Ending Balance, Plan Assets | [3],[5] | 0 |  | 0 |
Real Estate [Member] | Significant other observable inputs (Level 2) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets | [3],[5] | 17 |  |  |
Ending Balance, Plan Assets |  | 15 |  | 17 | [3],[5]
Real Estate [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets |  | 1,285 | [3],[5] | 1,165 |
Realized gains (losses) |  | 31 |  | 19 |
Unrealized gains relating to instruments still held in the reporting period |  | 17 |  | 18 |
Purchases, sales and settlements, net |  | 113 |  | 83 |
Ending Balance, Plan Assets | [3],[5] | 1,446 |  | 1,285 |
Other [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets | [3],[6] | 2,108 |  |  |
Ending Balance, Plan Assets | [3],[6] | 2,796 |  | 2,108 |
Other [Member] | Not Subject to Leveling [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets | [3],[6] | 1,819 |  |  |
Ending Balance, Plan Assets | [3],[6] | 2,509 |  | 1,819 |
Other [Member] | Quoted price in active markets (Level 1) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets |  | 0 |  |  |
Ending Balance, Plan Assets |  | 0 | [3],[6] | 0 |
Other [Member] | Significant other observable inputs (Level 2) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets | [3],[6] | 289 |  |  |
Ending Balance, Plan Assets | [3],[6] | 287 |  | 289 |
Other [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets | [3],[6] | 0 |  |  |
Ending Balance, Plan Assets | [3],[6] | 0 |  | 0 |
Cash & Cash Equivalents [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets | [3],[7] | 296 |  |  |
Ending Balance, Plan Assets | [3],[7] | 577 |  | 296 |
Cash & Cash Equivalents [Member] | Not Subject to Leveling [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets | [3],[7] | 121 |  |  |
Ending Balance, Plan Assets | [3],[7] | 498 |  | 121 |
Cash & Cash Equivalents [Member] | Quoted price in active markets (Level 1) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets |  | 100 |  |  |
Ending Balance, Plan Assets |  | 0 |  | 100 |
Cash & Cash Equivalents [Member] | Significant other observable inputs (Level 2) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets | [3],[7] | 75 |  |  |
Ending Balance, Plan Assets | [3],[7] | 79 |  | 75 |
Cash & Cash Equivalents [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets | [3],[7] | 0 |  |  |
Ending Balance, Plan Assets | [3],[7] | 0 |  | 0 |
Subtotal [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets |  | 30,123 |  |  |
Ending Balance, Plan Assets |  | 35,255 |  | 30,123 |
Other Assets & Liabilities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Beginning Balance, Plan Assets | [8] | 432 |  |  |
Ending Balance, Plan Assets |  | $ 434 |  | $ 432 | [8]
[1] | Represents commingled funds that invest primarily in common stocks.
[2] | Represents enhanced equity separate account and commingled fund portfolios. A portion of the portfolio may include long-short market neutral and relative value strategies that invest in publicly traded, equity and fixed income securities, as well as derivatives of equity and fixed income securities and foreign currency.
[3] | In accordance with ASU 2015-07, Fair Value Measurement (Topic 820), certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented for the total pension benefits plan assets.
[4] | Represents limited partner investments with general partners that primarily invest in debt and equity.
[5] | Represents investments in real estate including commingled funds and directly held properties.
[6] | Represents insurance contracts and global balanced risk commingled funds consisting mainly of equity, bonds and some commodities.
[7] | Represents short-term commercial paper, bonds and other cash or cash-like instruments.
[8] | Represents trust receivables and payables that are not leveled.

X
- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets sold. + 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)(5)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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X
- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held. + 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)(5)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + 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) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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