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Employee Benefits Schedule of Defined Benefit Plan Disclosures (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
Debt Securities— Domestic Government Other Postretirement Benefit Plan Assets | $ 5 | $ 5 |
Fair value of plan assets: |  |  |
As of January 1 |  | 546 |
Classification in consolidated balance sheet: |  |  |
Noncurrent asset | (38) | (36) |
Noncurrent liability | (247) | (307) |
Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Debt Securities— Domestic Government Other Postretirement Benefit Plan Assets | 0 | 0 |
Fair value of plan assets: |  |  |
As of January 1 | 0 | 0 |
Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Debt Securities— Domestic Government Other Postretirement Benefit Plan Assets | 0 | 0 |
Fair value of plan assets: |  |  |
As of January 1 | 49 | 67 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Debt Securities— Domestic Government Other Postretirement Benefit Plan Assets | 5 | 5 |
Fair value of plan assets: |  |  |
As of January 1 | 0 | 0 |
Pension Plans, Defined Benefit [Member] |  |  |
Benefit obligation: |  |  |
As of January 1 | 905 | 811 | $ 869
Fair value of plan assets: |  |  |
Service cost | 16 | 19 | 17
Interest cost on benefit obligation | 34 | 32 | 33
Participants’ contributions | 0 | 0 |
Actuarial loss (gain) | 88 | (67) |
Benefit payments | (42) | (39) |
Defined Benefit Plan, Plan Assets, Administration Expense | (2) | (3) |
As of January 1 | 695 | 546 | 629
Defined Benefit Plan, Funded (Unfunded) Status of Plan | (210) | (265) |
Net actuarial loss (gain) included in comprehensive income | (3) | 25 |
Defined Benefit Plan, Amortization of Gain (Loss) | (10) | (17) | (13)
Total Amounts included in comprehensive income | (13) | 8 |
Defined Benefit Plan, Accumulated Benefit Obligation | 813 | 734 |
Actual return on plan assets | 131 | (50) |
Company contributions | 62 | 9 |
Classification in consolidated balance sheet: |  |  |
Noncurrent asset | 0 | 0 |
Current liability | 0 | 0 |
Noncurrent liability | (210) | (265) |
Amounts included in AOCL: |  |  |
Net actuarial loss | 213 | 226 |
Prior service cost | 0 | 0 |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax | $ 213 | $ 226 |
Assumptions used: |  |  |
Discount rate used to calculate benefit obligation | 4.25% | 3.65% |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase | 3.65% | 3.65% |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 7.00% | 7.00% |
Other Postretirement Benefit Plans [Member] |  |  |
Benefit obligation: |  |  |
As of January 1 | $ 71 | $ 72 | 78
Fair value of plan assets: |  |  |
Service cost | 2 | 2 | 2
Interest cost on benefit obligation | 3 | 3 | 3
Participants’ contributions | 2 | 2 |
Actuarial loss (gain) | 8 | (7) |
Benefit payments | (6) | (6) |
Defined Benefit Plan, Plan Assets, Administration Expense | 0 | 0 |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment | 9 |  |
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment | 1 |  |
As of January 1 | 34 | 30 | 33
Defined Benefit Plan, Funded (Unfunded) Status of Plan | (37) | (42) |
Net actuarial loss (gain) included in comprehensive income | 5 | (4) |
Other Postretirement Benefits Cost (Reversal of Cost) | 9 |  |
Defined Benefit Plan, Amortization of Gain (Loss) | 0 | 0 | 0
Total Amounts included in comprehensive income | (4) | (4) |
Actual return on plan assets | 5 | (2) |
Company contributions | 3 | 3 |
Classification in consolidated balance sheet: |  |  |
Noncurrent asset | 0 | 0 |
Current liability | 0 | 0 |
Noncurrent liability | (37) | (42) |
Amounts included in AOCL: |  |  |
Net actuarial loss | 1 | (4) |
Prior service cost | (9) | 0 |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax | $ (8) | $ (4) |
Assumptions used: |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase | 4.58% | 4.58% |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 5.88% | 6.20% |
Non Qualified Benefit Plans [Member] |  |  |
Benefit obligation: |  |  |
As of January 1 | $ 26 | $ 24 | 27
Fair value of plan assets: |  |  |
Service cost | 0 | 0 | 0
Interest cost on benefit obligation | 1 | 1 | 1
Participants’ contributions | 0 | 0 |
Actuarial loss (gain) | 3 | (1) |
Benefit payments | (2) | (3) |
Defined Benefit Plan, Plan Assets, Administration Expense | 0 | 0 |
As of January 1 | 17 | 16 | 17
Defined Benefit Plan, Funded (Unfunded) Status of Plan | (9) | (8) |
Net actuarial loss (gain) included in comprehensive income | 3 | (1) |
Defined Benefit Plan, Amortization of Gain (Loss) | (1) | (1) | $ (1)
Total Amounts included in comprehensive income | 2 | (2) |
Defined Benefit Plan, Accumulated Benefit Obligation | 26 | 24 |
Actual return on plan assets | 1 | (1) |
Company contributions | 2 | 3 |
Classification in consolidated balance sheet: |  |  |
Noncurrent asset | (17) | (16) |
Current liability | (2) | (2) |
Noncurrent liability | (24) | (22) |
Amounts included in AOCL: |  |  |
Net actuarial loss | 13 | 11 |
Prior service cost | 0 | 0 |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax | $ 13 | $ 11 |
Assumptions used: |  |  |
Discount rate used to calculate benefit obligation | 3.43% | 3.65% |

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- Definition The net increase or decrease of changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.included in comprehensive income + References No definition available. + 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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- 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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