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Employee Benefits (Tables) | 12 Months Ended
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Dec. 31, 2019
Retirement Benefits [Abstract] |
Net Pension Cost and Amount Recognized in OCI for All Funded and Unfunded Plans | The components of net pension cost and the amount recognized in OCI for all funded and unfunded plans are as follows:
Year ended December 31, in millions | 2019 | 2018 | 2017
Interest cost on PBO | $ | 46 |  | $ | 41 |  | $ | 48 |
Expected return on plan assets | (48 | ) | (53 | ) | (68 | )
Amortization of losses | 13 |  | 17 |  | 15 |
Settlement loss | 18 |  | 17 |  | — |
Net pension cost | $ | 29 |  | $ | 22 |  | $ | (5 | )
Other changes in plan assets and benefit obligations recognized in OCI: |  |  |
Net (gain) loss | $ | (8 | ) | $ | 20 |  | $ | (10 | )
Amortization of gains | (31 | ) | (33 | ) | (15 | )
Total recognized in comprehensive income | $ | (39 | ) | $ | (13 | ) | $ | (25 | )
Total recognized in net pension cost and comprehensive income | $ | (10 | ) | $ | 9 |  | $ | (30 | )
Changes in PBO Related to Pension Plans | The following table summarizes changes in the PBO related to our pension plans. Actuarial losses in 2019 are primarily a result of a change in the discount rate assumption.
Year ended December 31, in millions | 2019 | 2018
PBO at beginning of year | $ | 1,201 |  | $ | 1,323 |
Interest cost | 46 |  | 41 |
Actuarial losses (gains) | 91 |  | (66 | )
Benefit payments | (105 | ) | (97 | )
PBO at end of year | $ | 1,233 |  | $ | 1,201 |
Changes in FVA | The following table summarizes changes in the FVA.
Year ended December 31, in millions | 2019 | 2018
FVA at beginning of year | $ | 1,046 |  | $ | 1,163 |
Actual return on plan assets | 147 |  | (34 | )
Employer contributions | 14 |  | 14 |
Benefit payments | (105 | ) | (97 | )
FVA at end of year | $ | 1,102 |  | $ | 1,046 |
Funded Status of Pension Plans Recognized in Balance Sheets | The following table summarizes the funded status of the pension plans, which equals the amounts recognized in the balance sheets at December 31, 2019, and December 31, 2018.
December 31, in millions | 2019 | 2018
Funded status (a) | $ | (131 | ) | $ | (155 | )
Net prepaid pension cost recognized consists of: |  |
Noncurrent assets | $ | 48 |  | 17 |
Current liabilities | (14 | ) | $ | (15 | )
Noncurrent liabilities | (165 | ) | (157 | )
Net prepaid pension cost recognized (b) | $ | (131 | ) | $ | (155 | )
(a) | The shortage of the FVA under the PBO.
(b) Represents the accrued benefit liability of the pension plans.
Plans ABO in Excess of Plan Assets | As indicated in the table below, collectively our plans had an ABO in excess of plan assets as follows:
December 31, | 2019 | 2018
in millions | Cash Balance Pension Plan | Other Defined Benefit Plans | Cash Balance Pension Plan | Other Defined Benefit Plans
PBO | $ | 1,054 |  | $ | 179 |  | $ | 1,029 |  | $ | 172 |
ABO | 1,054 |  | 179 |  | 1,029 |  | 172 |
Fair value of plan assets | 1,102 |  | — |  | 1,046 |  | — |
Weighted-Average Rates to Determine Actuarial Present Value of Benefit Obligations | To determine the actuarial present value of benefit obligations, we assumed the following weighted-average rates.
December 31, | 2019 | 2018
Discount rate | 2.89 | % | 4.00 | %
Compensation increase rate | N/A |  | N/A |
Weighted-average interest crediting rate | 2.39 | % | 3.02 | %
Weighted-Average Rates to Determine Net Pension Cost | To determine net pension cost, we assumed the following weighted-average rates.
Year ended December 31, | 2019 | 2018 | 2017
Discount rate | 4.00 | % | 3.25 | % | 3.75 | %
Compensation increase rate | N/A |  | N/A |  | N/A |
Expected return on plan assets | 4.50 |  | 4.75 |  | 6.00 |
Asset Target Allocations Prescribed by Pension Funds' Investment Policies | The following table shows the asset target allocations prescribed by the pension fund’s investment policies based on the plan’s funded status at December 31, 2019.
| Target Allocation
Asset Class | 2019
Equity securities: |
U.S. | 4 | %
International | 2 |
Fixed income securities | 87 |
Real assets | 4 |
Other assets | 3 |
Total | 100 | %
Fair Values of Pension Plan Assets by Asset Category | The following tables show the fair values of our pension plan assets by asset class at December 31, 2019, and December 31, 2018.
December 31, 2019 |  |  |  |
in millions | Level 1 | Level 2 | Level 3 | Total
ASSET CLASS |  |  |  |
Equity securities: |  |  |  |
Common — U.S. | $ | 8 |  | — |  | — |  | $ | 8 |
Preferred — U.S. | 3 |  | — |  | — |  | 3 |
Debt securities: |  |  |  |
Corporate bonds — U.S. | — |  | $ | 155 |  | — |  | 155 |
Corporate bonds — International | — |  | 72 |  | — |  | 72 |
Government and agency bonds — U.S. | — |  | 190 |  | — |  | 190 |
Government bonds — International | — |  | 2 |  | — |  | 2 |
State and municipal bonds | — |  | 27 |  | — |  | 27 |
Mutual funds: |  |  |  |
Equity — International | 2 |  | — |  | — |  | 2 |
Collective investment funds (measured at NAV) (a) | — |  | — |  | — |  | 584 |
Insurance investment contracts and pooled separate accounts (measured at NAV) (a) | — |  | — |  | — |  | 16 |
Other assets (measured at NAV) (a) | — |  | — |  | — |  | 43 |
Total net assets at fair value | $ | 13 |  | $ | 446 |  | — |  | $ | 1,102 |
(a) | Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the fair value of plan assets presented elsewhere within this footnote.
December 31, 2018 |  |  |  |
in millions | Level 1 | Level 2 | Level 3 | Total
ASSET CLASS |  |  |  |
Equity securities: |  |  |  |
Common — U.S. | 6 |  | — |  | — |  | 6 |
Common — International | — |  | — |  | — |  | — |
Preferred — U.S. | 3 |  | — |  | — |  | 3 |
Debt securities: |  |  |  |
Corporate bonds — U.S. | — |  | $ | 157 |  | — |  | 157 |
Corporate bonds — International | — |  | 65 |  | — |  | 65 |
Government and agency bonds — U.S. | — |  | 180 |  | — |  | 180 |
Government bonds — International | — |  | 2 |  | — |  | 2 |
State and municipal bonds | — |  | 28 |  | — |  | 28 |
Mutual funds: |  |  |  |
Equity — International | 1 |  | — |  | — |  | 1 |
Collective investment funds (measured at NAV) (a) | — |  | — |  | — |  | 546 |
Insurance investment contracts and pooled separate accounts (measured at NAV) (a) | — |  | — |  | — |  | 16 |
Other assets (measured at NAV) (a) | — |  | — |  | — |  | 42 |
Total net assets at fair value | $ | 10 |  | $ | 432 |  | — |  | $ | 1,046 |
(a) | Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the fair value of plan assets presented elsewhere within this footnote.
Pre-tax AOCI Not Yet Recognized as Net Postretirement Benefit Cost | The components of pre-tax AOCI not yet recognized as net postretirement benefit cost are shown below.
December 31, |  |
in millions | 2019 | 2018
Net unrecognized losses (gains) | $ | (10 | ) | $ | (12 | )
Net unrecognized prior service credit | (17 | ) | — |
Total unrecognized AOCI | $ | (27 | ) | $ | (12 | )
Net Postretirement Benefit Cost and Amount Recognized in OCI for All Funded and Unfunded Plans | The components of net postretirement benefit cost and the amount recognized in OCI for all funded and unfunded plans are as follows:
December 31, |  |  |
in millions | 2019 | 2018 | 2017
Service cost of benefits earned | $ | 1 |  | $ | 1 |  | $ | 1 |
Interest cost on APBO | 2 |  | 2 |  | 3 |
Expected return on plan assets | (2 | ) | (2 | ) | (2 | )
Amortization of prior service credit | — |  | (1 | ) | (1 | )
Amortization of gains | (1 | ) | (1 | ) | — |
Net postretirement benefit | — |  | (1 | ) | 1 |
Other changes in plan assets and benefit obligations recognized in OCI: |  |  |
Net (gain) loss | $ | 1 |  | $ | 1 |  | $ | (4 | )
Amortization of prior service credit | 1 |  | 1 |  | 1 |
Amortization of losses | — |  | — |  | — |
Total recognized in comprehensive income | $ | 2 |  | $ | 2 |  | $ | (3 | )
Total recognized in net postretirement benefit cost and comprehensive income | $ | 2 |  | $ | 1 |  | $ | (2 | )
Changes in APBO | The following table summarizes changes in the APBO. Actuarial losses are a result of asset performance.
Year ended December 31, |  |
in millions | 2019 | 2018
APBO at beginning of year | $ | 63 |  | $ | 69 |
Service cost | 1 |  | 1 |
Interest cost | 2 |  | 2 |
Plan participants’ contributions | 1 |  | 1 |
Actuarial losses (gains) | 10 |  | (6 | )
Benefit payments | (8 | ) | (4 | )
APBO at end of year | $ | 52 |  | $ | 63 |
Change in FVA (Other Post Retirement Benefit Plan Assets) | The following table summarizes changes in FVA.
Year ended December 31, |  |
in millions | 2019 | 2018
FVA at beginning of year | $ | 47 |  | $ | 52 |
Employer contributions | — |  | — |
Plan participants’ contributions | 1 |  | 1 |
Benefit payments | (8 | ) | (4 | )
Actual return on plan assets | 12 |  | (2 | )
FVA at end of year | $ | 52 |  | $ | 47 |
Funded Status of Postretirement Plans Recognized in Balance Sheets | The following table summarizes the funded status of the postretirement plans, which corresponds to the amounts recognized in the balance sheets at December 31, 2019, and December 31, 2018.
December 31, |  |
in millions | 2019 | 2018
Funded status (a) | — |  | $ | (17 | )
Accrued postretirement benefit cost recognized (b) | — |  | (17 | )
(a) | The shortage of the FVA under the APBO.
(b) Consists entirely of noncurrent liabilities.
Weighted-Average Rates to Determine Net Postretirement Benefit Cost | To determine net postretirement benefit cost, we assumed the following weighted-average rates.
Year ended December 31, | 2019 | 2018 | 2017
Discount rate | 4.50 | % | 3.50 | % | 3.75 | %
Expected return on plan assets | 4.50 |  | 4.50 |  | 4.50 |
Asset Target Allocations Prescribed by Trusts' Investment Policies | The following table shows the asset target allocations prescribed by the trust’s investment policy.
| Target Allocation
Asset Class | 2019
Equity securities | 80 | %
Fixed income securities | 20 |
Cash equivalents | — |
Total | 100 | %
Fair Values of Pension Plan Assets by Asset Category | The following tables show the fair values of our postretirement plan assets by asset class at December 31, 2019, and December 31, 2018.
December 31, 2019 |  |  |  |
in millions | Level 1 | Level 2 | Level 3 | Total
ASSET CLASS |  |  |  |
Mutual funds: |  |  |  |
Equity — U.S. | $ | 22 |  | — |  | — |  | $ | 22 |
Equity — International | 9 |  | — |  | — |  | 9 |
Fixed income — U.S. | 7 |  | — |  | — |  | 7 |
Collective investment funds: |  |  |  |
Equity — U.S.(a) | — |  | — |  | — |  | 12 |
Other assets (measured at NAV)(a) | — |  | — |  | — |  | 2 |
Total net assets at fair value | $ | 38 |  | — |  | — |  | $ | 52 |
(a) | Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the fair value of plan assets presented elsewhere within this footnote.
December 31, 2018 |  |  |  |
in millions | Level 1 | Level 2 | Level 3 | Total
ASSET CLASS |  |  |  |
Mutual funds: |  |  |  |
Equity — U.S. | $ | 21 |  | — |  | — |  | $ | 21 |
Equity — International | 8 |  | — |  | — |  | 8 |
Fixed income — U.S. | 7 |  | — |  | — |  | 7 |
Fixed income — International | — |  | — |  | — |  | — |
Collective investment funds: |  |  |  |
Equity — U.S. (a) | — |  | $ | — |  | — |  | 9 |
Other assets (measured at NAV) | — |  | — |  | — |  | 2 |
Total net assets at fair value | $ | 36 |  | $ | — |  | — |  | $ | 47 |
(a) Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the fair value of plan assets presented elsewhere within this footnote.

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