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Pension Plans and Other Postretirement Plans - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution plan, employer contributions | $ 334 | $ 314 | $ 295
Pre-tax settlement gains (losses) | 0 | (187) | 0
Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pre-tax settlement gains (losses) | $ 0 | $ (187) | $ 0
Weighted average discount rate | 4.40% |  |
Discount rate | 4.00% | 3.50% | 4.00%
Expected long-term return on plan assets | 6.60% | 4.00% | 5.50%
Employer contributions | $ 12 | $ 46 | $ 25
Multiemployer plans, plan contributions | 18 | 17 | 15
Benefit obligation | 5,841 | 131 | 844
Net periodic benefit cost | $ (6) | 208 | $ 27
Pension Plan | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target investment allocations | 31.00% |  |
Pension Plan | Debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target investment allocations | 57.00% |  |
Pension Plan | Real Estate Investment |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target investment allocations | 6.00% |  |
Pension Plan | Private equity investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target investment allocations | 3.00% |  |
Pension Plan | Hedge Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target investment allocations | 3.00% |  |
Pension Plan | Qualified Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate |  |  | 3.10%
Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Multiemployer plans, plan contributions | $ 58 | 58 | $ 52
Benefit obligation | 228 | 25 |
Net periodic benefit cost | $ 2 | $ 1 | $ 1

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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 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 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 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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