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Pension and Other Postretirement Plans - Reconciliation of the Change in Benefit Obligation and Plan Asset, Funded Status and Amounts Recognized in the Financial Statements (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation | $ 4,448 | $ 4,739 |
Change in projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year | 5,852 |  | $ 5,253
Service cost | 228 | 195 | 112
Interest cost | 217 | 220 | 200
Actuarial (gain) loss | (601) | 525 |
Gross benefits paid and settlements | (292) | (366) |
Other | (8) | 25 |
Projected benefit obligation at end of year | 5,396 | 5,852 |
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 3,932 |  | 3,355
Actual (loss) return on plan assets | (215) | 510 |
Employer contributions | 413 | 419 |
Gross benefits paid and settlements | (292) | (366) |
Other | (11) | 14 |
Fair value of plan assets at end of year | 3,827 | 3,932 |
Funded status—Net amount recognized | (1,569) | (1,920) |
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Noncurrent asset | 13 | 9 |
Current liability | (6) | (8) |
Noncurrent liability | (1,576) | (1,921) |
Total liability | (1,569) | (1,920) |
Amounts recognized in accumulated other comprehensive loss consist of: |  |  |
Net actuarial loss | (1,382) | (1,610) |
Prior service cost | (5) | (1) |
Total accumulated other comprehensive loss | (1,387) | (1,611) |
Other Postretirement Benefits |  |  |
Change in projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year | 1,710 |  | 1,687
Service cost | 12 | 13 | 19
Interest cost | 61 | 66 | 86
Plan participants' contributions | 68 | 68 |
Actuarial (gain) loss | (285) | 40 |
Benefits paid | (181) | (178) |
Other | 6 | 14 |
Projected benefit obligation at end of year | 1,391 | 1,710 |
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 54 |  | $ 55
Actual (loss) return on plan assets | 1 | 1 |
Employer contributions | 111 | 108 |
Plan participants' contributions | 68 | 68 |
Benefits paid | (181) | (178) |
Fair value of plan assets at end of year | 53 | 54 |
Funded status—Net amount recognized | (1,338) | (1,656) |
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Current liability | (43) | (54) |
Noncurrent liability | (1,295) | (1,602) |
Total liability | (1,338) | (1,656) |
Amounts recognized in accumulated other comprehensive loss consist of: |  |  |
Net actuarial loss | 554 | 301 |
Prior service cost | 170 | 208 |
Total accumulated other comprehensive loss | $ 724 | $ 509 |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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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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