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Employee Benefit Plans (Pension and Postretirement Plans) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Other | $ (116) |  | $ 542 | $ 326 |  |
Beginning Balance, Plan Assets | 30,555 |  |  |  |  |
Ending Balance, Plan Assets | 35,689 |  | 30,555 |  |  |
Noncurrent liability |  |  |  |  | $ 3,036 | $ 5,612
Payment for Pension Benefits | 2,112 |  | 303 | 147 |  |
Current year actuarial gain | (241) |  | 785 | 284 |  |
Current year prior service cost/credit | (2) |  | 13 | 37 |  |
Amortization of prior service credit | 529 |  | 535 | 867 |  |
Other Postretirement Benefits Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Beginning Balance, Benefit Obligation | 805 |  | 890 |  |  |
Service Cost | 2 |  | 3 | 3 |  |
Interest cost | 29 |  | 34 | 34 |  |
Actuarial loss (gain) | (4) |  | (48) |  |  |
Total benefits paid | 87 |  | 97 |  |  |
Other | 22 |  | 23 |  |  |
Ending Balance, Benefit Obligation | 767 |  | 805 | 890 |  |
Beginning Balance, Plan Assets | 0 |  | 0 |  |  |
Employer Contributions | 71 |  | 80 |  |  |
Defined Benefit Plan, Plan Assets, Benefits Paid | 87 |  | 97 |  |  |
Other | 16 |  | 17 |  |  |
Ending Balance, Plan Assets | 0 |  | 0 | 0 |  |
Benefit obligations | 805 |  | 890 | 890 | 767 | 805
Funded status of plan |  |  |  |  | (767) | (805)
Current liability |  |  |  |  | 72 | 78
Noncurrent liability |  |  |  |  | 695 | 727
Net amount recognized |  |  |  |  | (767) | (805)
Net actuarial gain |  |  |  |  | 143 | 152
Prior service credit |  |  |  |  | (10) | (5)
Net amount recognized |  |  |  |  | (153) | $ (157)
Amortization of prior service credit | (1) |  | 0 | 0 |  |
Recognized actuarial net (gain) loss - in net periodic cost | (9) |  | (4) | (4) |  |
Impact of change in estimation of NPPC | 21 |  | 33 | 32 |  |
Net settlement and curtailment gain | 0 |  | $ 0 | $ (1) |  |
Current year actuarial gain | (2) |  |  |  |  |
Amortization of actuarial gain | 9 |  |  |  |  |
Current year prior service cost/credit | (6) |  |  |  |  |
Amortization of prior service credit | (1) |  |  |  |  |
Other | 2 |  |  |  |  |
Total recognized in other comprehensive loss | 4 |  |  |  |  |
Net recognized in net periodic pension cost and other comprehensive loss | $ 25 |  |  |  |  |
Net actuarial loss/gain |  |  |  |  | (10) |
Prior service credit |  |  |  |  | $ 3 |
Discount rate, benefit obligation |  |  |  |  | 3.40% | 3.80%
Discount rate, net cost | 3.80% |  | 4.00% | 3.80% |  |
Health care cost trend rate assumed for next year |  |  |  |  | 7.00% | 6.50%
Rate that the cost trend rate gradually declines to |  |  |  |  | 5.00% | 5.00%
Year that the rate reaches the rate it is assumed to remain at | 2026 |  | 2022 |  |  |
Effect on total service and interest cost - increase | $ 2 |  |  |  |  |
Effect on postretirement benefit obligation - increase | 40 |  |  |  |  |
Effect on total service and interest cost - decrease | 2 |  |  |  |  |
Effect on postretirement benefit obligation - decrease | 35 |  |  |  |  |
Pension Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Beginning Balance, Benefit Obligation | 34,923 |  | $ 35,428 |  |  |
Service Cost | 374 |  | 383 | $ 493 |  |
Interest cost | 1,120 |  | 1,183 | 1,399 |  |
Actuarial loss (gain) | 1,804 |  | 1,831 |  |  |
Total benefits paid | 1,782 |  | 1,660 |  |  |
Net settlement, curtailment, and special termination benefits | (49) |  | (1,566) |  |  |
Other | 609 |  | (676) |  |  |
Ending Balance, Benefit Obligation | 36,999 |  | 34,923 | 35,428 |  |
Beginning Balance, Plan Assets | 30,555 |  | 31,011 |  |  |
Actual return on plan assets | 4,258 |  | 3,202 |  |  |
Employer Contributions | 2,188 |  | 384 |  |  |
Defined Benefit Plan, Plan Assets, Benefits Paid | 1,782 |  | 1,660 |  |  |
Settlements | 41 |  | 1,632 |  |  |
Other | (511) |  | 750 |  |  |
Ending Balance, Plan Assets | 35,689 |  | 30,555 | 31,011 |  |
Fair value of plan assets |  |  |  |  | $ 20,438 | $ 27,943
Benefit obligations | 34,923 |  | 35,428 | 35,428 | 36,999 | 34,923
Funded status of plan |  |  |  |  | (1,310) | (4,368)
Noncurrent assets |  |  |  |  | 957 | 451
Current liability |  |  |  |  | 70 | 72
Noncurrent liability |  |  |  |  | 2,197 | 4,747
Net amount recognized |  |  |  |  | (1,310) | (4,368)
Net actuarial gain |  |  |  |  | (7,238) | (7,941)
Prior service credit |  |  |  |  | 37 | (6)
Net amount recognized |  |  |  |  | 7,275 | 7,935
Projected benefit obligation |  |  |  |  | 22,360 | 32,732
Accumulated benefit obligation |  |  |  |  | 22,159 | $ 32,095
Expected return on plan assets | 2,215 |  | 2,202 | 2,264 |  |
Amortization of prior service credit | (36) |  | (33) | (11) |  |
Recognized actuarial net (gain) loss - in net periodic cost | 575 |  | 572 | 882 |  |
Impact of change in estimation of NPPC | (179) |  | 401 | 649 |  |
Net settlement and curtailment gain | 3 |  | $ 498 | $ 150 |  |
Current year actuarial gain | (239) |  |  |  |  |
Amortization of actuarial gain | (575) |  |  |  |  |
Current year prior service cost/credit | 4 |  |  |  |  |
Amortization of prior service credit | (36) |  |  |  |  |
Net settlement and curtailment loss | (11) |  |  |  |  |
Other | 125 |  |  |  |  |
Total recognized in other comprehensive loss | (660) |  |  |  |  |
Net recognized in net periodic pension cost and other comprehensive loss | $ (839) |  |  |  |  |
Net actuarial loss/gain |  |  |  |  | (402) |
Prior service credit |  |  |  |  | (41) |
Total amount to be amortized from AOCI to NPPC |  |  |  |  | $ 361 |
Salary scale, benefit obligation |  |  |  |  | 4.20% | 4.10%
Expected return on plan assets, benefit obligation |  |  |  |  | 0.00% | 0.00%
Salary scale, net cost | 4.10% |  | 4.20% | 4.20% |  |
Expected return on plan assets, net cost | 7.30% |  | 7.30% | 7.60% |  |
PBO [Member] | Pension Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Discount rate, benefit obligation |  |  |  |  | 3.40% | 3.80%
Discount rate, net cost | 3.80% |  | 4.10% | 3.80% |  |
Interest cost [Member] | Pension Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Discount rate, benefit obligation |  |  |  |  | 0.00% | 0.00%
Discount rate, net cost | 3.30% |  | 3.40% | 0.00% |  |
Service cost [Member] | Pension Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Discount rate, benefit obligation |  |  |  |  | 0.00% | 0.00%
Discount rate, net cost | 3.60% |  | 3.80% | 0.00% |  |
Real Estate [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Beginning Balance, Plan Assets | $ 1,815 |  |  |  |  |
Ending Balance, Plan Assets | 1,857 | [1],[2] | $ 1,815 |  |  |
Private Equity Funds [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Beginning Balance, Plan Assets | 1,361 |  |  |  |  |
Ending Balance, Plan Assets | $ 1,216 | [1],[3] | $ 1,361 |  |  |
[1] | 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.
[2] | Represents investments in real estate including commingled funds and directly held properties.
[3] | Represents limited partner investments with general partners that primarily invest in debt and equity.

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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details
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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + 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 (j) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + 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 (a)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + 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 (h)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + 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 (k)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + 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 (k)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + 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 (k)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + 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 (a) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + 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)(ii) -URI http://asc.fasb.org/extlink&oid=82843861&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 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 4: 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)(01) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of decrease in accumulated postretirement benefit obligation from one-percentage-point decrease in assumed health care cost trend rate. + 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 (m) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of decrease in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point decrease in assumed health care cost trend rate. + 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 (m) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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