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Benefit Plans and Other Postretirement Benefits - Net Benefit Costs and Funded Status (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Annual periodic pension cost |  |  |  |
Curtailment gain | $ (8) |  |  |
Pension and other post retirement benefit obligations |  |  |  |
Curtailment gain | $ (32) |  |  |
Pension Benefits |  |  |  |
Annual periodic pension cost |  |  |  |
Service cost benefits earned |  | $ 10 | $ 23 | $ 26
Interest cost on benefit obligation |  | 46 | 44 | 43
Expected return on plan assets |  | (59) | (62) | (58)
Amortization of unrecognized net loss |  | 3 | 0 | 4
Curtailment gain |  | 0 | 7 | 0
Net periodic benefit cost |  | 0 | 12 | 15
Pension and other post retirement benefit obligations |  |  |  |
Benefit obligation at January 1 |  | 1,222 | 1,329 |
Service cost |  | 10 | 23 | 26
Interest cost |  | 46 | 44 | 43
Plan amendments |  | 0 | 17 |
Actuarial (gain)/loss |  | 207 | (95) |
Employee and retiree contributions |  | 0 | 0 |
Curtailment gain |  | 0 | (20) |
Benefit payments |  | (88) | (76) |
Benefit obligation at December 31 |  | 1,397 | 1,222 | 1,329
Fair value of plan assets for pension and other post retirement benefit |  |  |  |
Fair value of plan assets at January 1 |  | 981 | 1,104 |
Actual return on plan assets |  | 216 | (80) |
Employee and retiree contributions |  | 0 | 0 |
Employer contributions |  | 41 | 33 |
Benefit payments |  | (88) | (76) |
Fair value of plan assets at December 31 |  | 1,150 | 981 | 1,104
Funded status at December 31 — excess of obligation over assets |  | (247) | (241) |
Other Postretirement Benefits Plan |  |  |  |
Annual periodic pension cost |  |  |  |
Service cost benefits earned |  | 1 | 1 | 1
Interest cost on benefit obligation |  | 3 | 4 | 4
Amortization of unrecognized prior service credit |  | (13) | (10) | (9)
Amortization of unrecognized net loss |  | 0 | 0 | (1)
Curtailment gain |  | 0 | (10) | 0
Net periodic benefit cost |  | (9) | (15) | (5)
Pension and other post retirement benefit obligations |  |  |  |
Benefit obligation at January 1 |  | 83 | 128 |
Service cost |  | 1 | 1 | 1
Interest cost |  | 3 | 4 | 4
Plan amendments |  | (2) | (28) |
Actuarial (gain)/loss |  | 16 | (6) |
Employee and retiree contributions |  | 4 | 3 |
Curtailment gain |  | 0 | (7) |
Benefit payments |  | (12) | (12) |
Benefit obligation at December 31 |  | 93 | 83 | 128
Fair value of plan assets for pension and other post retirement benefit |  |  |  |
Fair value of plan assets at January 1 |  | 0 | 0 |
Actual return on plan assets |  | 0 | 0 |
Employee and retiree contributions |  | 4 | 3 |
Employer contributions |  | 7 | 9 |
Benefit payments |  | (11) | (12) |
Fair value of plan assets at December 31 |  | 0 | 0 | $ 0
Funded status at December 31 — excess of obligation over assets |  | $ (93) | $ (83) |

X
- 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -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 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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