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Employee Benefits - Net Periodic Benefit Cost (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Other changes in plan assets and benefit obligations recognized in other comprehensive income, net of tax |  |  |
Settlement charge | $ 113 |  |
Total recognized | (102) | $ 5 | $ (41)
Retirement Plans |  |  |
Components of net periodic cost for retirement plans and post-retirement plans |  |  |
Service cost | 3 | 3 | 3
Interest cost | 64 | 71 | 74
Expected return on assets | (108) | (124) | (126)
Actuarial loss (gain) | 12 | 20 | 18
Prior service credit | 0 | 0 | 0
Total net periodic benefit cost | (29) | (30) | (31)
Settlement charge | 113 | 4 | 8
Total net periodic benefit cost | 84 | (26) | (23)
Other changes in plan assets and benefit obligations recognized in other comprehensive income, net of tax |  |  |
Net actuarial (gain) loss | (10) | 28 | (20)
Recognized actuarial (gain) loss | (10) | (15) | (12)
Prior service (credit) cost | 0 | 1 | 0
Settlement charge | (85) | (4) | (7)
Total recognized | (105) | 10 | (39)
Postretirement Plans |  |  |
Components of net periodic cost for retirement plans and post-retirement plans |  |  |
Service cost | 0 | 0 | 0
Interest cost | 1 | 1 | 2
Expected return on assets | 0 | 0 | 0
Actuarial loss (gain) | (2) | (2) | (2)
Prior service credit | (1) | (1) | (2)
Total net periodic benefit cost | (2) | (2) | (2)
Settlement charge | 0 | 0 | 0
Total net periodic benefit cost | (2) | (2) | (2)
Other changes in plan assets and benefit obligations recognized in other comprehensive income, net of tax |  |  |
Net actuarial (gain) loss | 0 | (7) | (3)
Recognized actuarial (gain) loss | 1 | 1 | 1
Prior service (credit) cost | 1 | 1 | 1
Settlement charge | 0 | 0 | 0
Total recognized | $ 2 | $ (5) | $ (1)

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- Definition Amount of payment, which decreases benefit obligation of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. Excludes decreases to benefit obligation for remeasurement due to settlement. + 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)(10) -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 30 -Section 15 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 + Details
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