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Employee Benefit Plans - Narrative (Details) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 20, 2020 | Jan. 01, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Increase (decrease) in post-retirement benefit liability |  |  |  | $ (102,000,000) |
Employer contributions |  |  | $ 0 | 0 | $ 0
Expected future contributions |  |  | 0 |  |
Pension plan assets at fair value |  |  | 2,825,000,000 | 2,431,000,000 |
Special termination benefits |  |  |  |  | 56,000,000
Amount of premium expenses incurred under the plan |  |  | 26,000,000 | 30,000,000 | 40,000,000
Expense associated with savings plans |  |  | $ 41,000,000 | 41,000,000 | 39,000,000
Equity |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Targeted allocation of total plan assets in domestic equity |  |  | 37.00% |  |
Targeted allocation of total plan assets in international equity |  |  | 23.00% |  |
Percentage within which the planned allocation is managed |  |  | 3.00% |  |
Pension plan assets at fair value |  |  | $ 1,770,000,000 | 1,698,000,000 |
Fixed Income |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Target allocation percentage of pension assets |  |  | 40.00% |  |
Pension plan assets at fair value |  |  | $ 818,000,000 | 704,000,000 |
Pension and Other Post-Employment Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Gain (loss) recognized in other comprehensive income |  |  |  | 102,000,000 |
Post-retirement benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Life insurance and contributions to the medical program for eligible retirees will be eliminated (younger than) |  | 65 years |  |  |
Increase (decrease) in post-retirement benefit liability |  |  | 0 | 102,000,000 |
Pension plan assets at fair value |  |  | 0 | 0 | 0
Special termination benefits |  |  | 0 | 0 | 13,000,000
Curtailment losses |  |  |  |  | 13,000,000
Pre-tax (loss) gain to be amortized |  |  | 74,000,000 |  |
Post-retirement benefits | Nonqualified Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer contributions |  |  | 26,000,000 | 30,000,000 |
Pension Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Increase (decrease) in post-retirement benefit liability |  |  | 0 | 0 |
Pension plan assets at fair value |  |  | 2,825,000,000 | 2,431,000,000 | 2,833,000,000
Decrease to pension liabilities |  |  |  |  | 85,000,000
Special termination benefits |  |  | 0 | 0 | 60,000,000
Curtailment losses |  |  |  |  | 4,000,000
Pre-tax (loss) gain to be amortized |  |  | (879,000,000) |  |
Pension Plans | Qualified Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Settlement losses |  |  |  |  | 11,000,000
Pension Plans | Nonqualified Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer contributions |  |  | $ 17,000,000 | $ 17,000,000 |
Settlement losses |  |  |  |  | $ 12,000,000
Subsequent Event | Plan | Post-retirement benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Life insurance and contributions to the medical program for eligible retirees will be eliminated (65 or older) | 65 years |  |  |  |

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- Definition Target allocation percentage of investments in equity securities to total plan assets in domestic equity. + References No definition available. + Details
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- Definition Target allocation percentage of investments in equity securities to total plan assets in international equity. + References No definition available. + Details
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- Definition The impact related to special termination benefits/curtailments offered to and accepted by employees in connection with their termination of employment that are only offered for a short period of time. This eliminates the accrual of defined benefits for future services related to affected employees. + References No definition available. + Details
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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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