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Employee Benefit Plans - Schedule of Changes in Benefit Obligation and Fair Value of Plan Assets (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018
Change in Projected Benefit Obligation: |  |  |  |  |
Post-retirement Plan Amendment |  | $ 102,000,000 |  |  |
Change in Plan Assets: |  |  |  |  |
Fair Value of Plan Assets at Beginning of Plan Year | $ 2,431,000,000 |  |  |  |
Non-qualified Employer Contributions | 0 | 0 | $ 0 |  |
Fair Value of Plan Assets at End of Plan Year | 2,825,000,000 | 2,431,000,000 |  |  |
Capitalized service costs | 3,000,000 | 3,000,000 |  |  |
Pension Benefits |  |  |  |  |
Actuarial Present Value of Benefit Obligation |  |  |  |  |
Accumulated Benefit Obligation |  |  |  | $ 2,963,000,000 | $ 2,623,000,000
Projected Benefit Obligation | 2,758,000,000 | 2,758,000,000 | 3,002,000,000 | 3,122,000,000 | 2,758,000,000
Change in Projected Benefit Obligation: |  |  |  |  |
Projected Benefit Obligation at Beginning of Plan Year | 2,758,000,000 | 3,002,000,000 |  |  |
Service Cost | 34,000,000 | 36,000,000 |  |  |
Interest Cost | 103,000,000 | 92,000,000 | 92,000,000 |  |
Plan Participants' Contributions | 0 | 0 |  |  |
Post-retirement Plan Amendment | 0 | 0 |  |  |
Actuarial Loss (Gain) | 418,000,000 | (173,000,000) |  |  |
Benefits Paid | (191,000,000) | (199,000,000) |  |  |
Benefit Obligation at End of Plan Year | 3,122,000,000 | 2,758,000,000 | 3,002,000,000 |  |
Change in Plan Assets: |  |  |  |  |
Fair Value of Plan Assets at Beginning of Plan Year | 2,431,000,000 | 2,833,000,000 |  |  |
Actual Return on Plan Assets Gain (Loss) | 568,000,000 | (220,000,000) |  |  |
Plan Participants' Contributions | 0 | 0 |  |  |
Benefits Paid | (191,000,000) | (199,000,000) |  |  |
Fair Value of Plan Assets at End of Plan Year | 2,825,000,000 | 2,431,000,000 | 2,833,000,000 |  |
Funded Status at End of Plan Year |  |  |  | (297,000,000) | (327,000,000)
Pension Benefits | Nonqualified Plan |  |  |  |  |
Change in Plan Assets: |  |  |  |  |
Non-qualified Employer Contributions | 17,000,000 | 17,000,000 |  |  |
Post-retirement Benefits |  |  |  |  |
Actuarial Present Value of Benefit Obligation |  |  |  |  |
Projected Benefit Obligation | 118,000,000 | 118,000,000 | 250,000,000 | 117,000,000 | 118,000,000
Change in Projected Benefit Obligation: |  |  |  |  |
Projected Benefit Obligation at Beginning of Plan Year | 118,000,000 | 250,000,000 |  |  |
Service Cost | 1,000,000 | 2,000,000 |  |  |
Interest Cost | 2,000,000 | 7,000,000 | 7,000,000 |  |
Plan Participants' Contributions | 7,000,000 | 5,000,000 |  |  |
Post-retirement Plan Amendment | 0 | (102,000,000) |  |  |
Actuarial Loss (Gain) | 22,000,000 | (10,000,000) |  |  |
Benefits Paid | (33,000,000) | (34,000,000) |  |  |
Benefit Obligation at End of Plan Year | 117,000,000 | 118,000,000 | 250,000,000 |  |
Change in Plan Assets: |  |  |  |  |
Fair Value of Plan Assets at Beginning of Plan Year | 0 | 0 |  |  |
Actual Return on Plan Assets Gain (Loss) | 0 | 0 |  |  |
Plan Participants' Contributions | 7,000,000 | 4,000,000 |  |  |
Benefits Paid | (33,000,000) | (34,000,000) |  |  |
Fair Value of Plan Assets at End of Plan Year | 0 | 0 | $ 0 |  |
Funded Status at End of Plan Year |  |  |  | $ (117,000,000) | $ (118,000,000)
Post-retirement Benefits | Nonqualified Plan |  |  |  |  |
Change in Plan Assets: |  |  |  |  |
Non-qualified Employer Contributions | $ 26,000,000 | $ 30,000,000 |  |  |

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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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- 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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