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Pension and Other Postretirement Benefits (Tables) | 12 Months Ended
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Dec. 31, 2021
Retirement Benefits [Abstract] |
Schedule of plan assets, benefit obligations, funded status for the U.S. and Canadian plans | Our plan assets, benefit obligations, funded status and amounts recognized on our consolidated balance sheets for our North America and United Kingdom plans as of the December 31 measurement date are as follows:
| Pension Plans |  | Retiree Medical Plans
| North America |  | United Kingdom |  | North America
| December 31, |  | December 31, |  | December 31,
| 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
| (in millions)
Change in plan assets |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets as of January 1 | $ | 846 |  |  | $ | 790 |  |  | $ | 491 |  |  | $ | 418 |  |  | $ | — |  |  | $ | — |
Return on plan assets | 15 |  |  | 96 |  |  | 20 |  |  | 58 |  |  | — |  |  | — |
Employer contributions | 14 |  |  | 22 |  |  | 26 |  |  | 23 |  |  | 4 |  |  | 4 |
Plan participant contributions | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1 |
Benefit payments | (46) |  |  | (66) |  |  | (27) |  |  | (25) |  |  | (4) |  |  | (5) |
Foreign currency translation | 1 |  |  | 4 |  |  | (5) |  |  | 17 |  |  | — |  |  | — |
Fair value of plan assets as of December 31 | 830 |  |  | 846 |  |  | 505 |  |  | 491 |  |  | — |  |  | — |
Change in benefit obligation |  |  |  |  |  |  |  |  |  |  |
Benefit obligation as of January 1 | (884) |  |  | (839) |  |  | (643) |  |  | (597) |  |  | (35) |  |  | (37) |
Service cost | (20) |  |  | (17) |  |  | — |  |  | — |  |  | — |  |  | — |
Interest cost | (21) |  |  | (25) |  |  | (9) |  |  | (11) |  |  | (1) |  |  | (1) |
Benefit payments | 46 |  |  | 66 |  |  | 27 |  |  | 25 |  |  | 4 |  |  | 5 |
Foreign currency translation | (1) |  |  | (4) |  |  | 6 |  |  | (20) |  |  | — |  |  | — |
Plan participant contributions | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (1) |
Change in assumptions and other | 39 |  |  | (65) |  |  | 29 |  |  | (40) |  |  | — |  |  | (1) |
Benefit obligation as of December 31 | (841) |  |  | (884) |  |  | (590) |  |  | (643) |  |  | (32) |  |  | (35) |
Funded status as of December 31 | $ | (11) |  |  | $ | (38) |  |  | $ | (85) |  |  | $ | (152) |  |  | $ | (32) |  |  | $ | (35) |
Schedule of amounts recognized in consolidated balance sheets | Amounts recognized on the consolidated balance sheets consist of the following:
| Pension Plans |  | Retiree Medical Plans
| North America |  | United Kingdom |  | North America
| December 31, |  | December 31, |  | December 31,
| 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
| (in millions)
Other assets | $ | 16 |  |  | $ | 10 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Accrued expenses | — |  |  | — |  |  | — |  |  | — |  |  | (3) |  |  | (3) |
Other liabilities | (27) |  |  | (48) |  |  | (85) |  |  | (152) |  |  | (29) |  |  | (32) |
| $ | (11) |  |  | $ | (38) |  |  | $ | (85) |  |  | $ | (152) |  |  | $ | (32) |  |  | $ | (35) |
Schedule of pre-tax amounts recognized in accumulated other comprehensive loss | Pre-tax amounts recognized in accumulated other comprehensive loss consist of the following:
| Pension Plans |  | Retiree Medical Plans
| North America |  | United Kingdom |  | North America
| December 31, |  | December 31, |  | December 31,
| 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
| (in millions)
Prior service cost | $ | 3 |  |  | $ | 4 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | — |  |  | $ | — |
Net actuarial loss | 43 |  |  | 79 |  |  | 89 |  |  | 129 |  |  | 4 |  |  | 4 |
| $ | 46 |  |  | $ | 83 |  |  | $ | 90 |  |  | $ | 130 |  |  | $ | 4 |  |  | $ | 4 |
Schedule of net periodic benefit cost and other amounts recognized in accumulated other comprehensive loss | Net periodic benefit cost (income) and other amounts recognized in other comprehensive (income) loss for the years ended December 31 included the following:
| Pension Plans |  | Retiree Medical Plans
| North America |  | United Kingdom |  | North America
| 2021 |  | 2020 |  | 2019 |  | 2021 |  | 2020 |  | 2019 |  | 2021 |  | 2020 |  | 2019
| (in millions)
Service cost | $ | 20 |  |  | $ | 17 |  |  | $ | 14 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost | 21 |  |  | 25 |  |  | 30 |  |  | 9 |  |  | 11 |  |  | 15 |  |  | 1 |  |  | 1 |  |  | 1 |
Expected return on plan assets | (24) |  |  | (30) |  |  | (32) |  |  | (14) |  |  | (14) |  |  | (18) |  |  | — |  |  | — |  |  | — |
Amortization of prior service cost (benefit) | 1 |  |  | 1 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (1) |
Amortization of actuarial loss (gain) | 5 |  |  | 3 |  |  | — |  |  | 4 |  |  | 3 |  |  | — |  |  | — |  |  | (1) |  |  | (1) |
Net periodic benefit cost (income) | 23 |  |  | 16 |  |  | 12 |  |  | (1) |  |  | — |  |  | (3) |  |  | 1 |  |  | — |  |  | (1) |
Net actuarial (gain) loss | (31) |  |  | (1) |  |  | 3 |  |  | (36) |  |  | (4) |  |  | 60 |  |  | — |  |  | 1 |  |  | (4) |
Prior service cost (credit) | — |  |  | — |  |  | 4 |  |  | — |  |  | — |  |  | (3) |  |  | — |  |  | — |  |  | — |
Amortization of prior service (cost) benefit | (1) |  |  | (1) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1 |
Amortization of actuarial (loss) gain | (5) |  |  | (3) |  |  | — |  |  | (4) |  |  | (3) |  |  | — |  |  | — |  |  | 1 |  |  | 1 |
Total recognized in other comprehensive (income) loss | (37) |  |  | (5) |  |  | 7 |  |  | (40) |  |  | (7) |  |  | 57 |  |  | — |  |  | 2 |  |  | (2) |
Total recognized in net periodic benefit cost (income) and other comprehensive (income) loss | $ | (14) |  |  | $ | 11 |  |  | $ | 19 |  |  | $ | (41) |  |  | $ | (7) |  |  | $ | 54 |  |  | $ | 1 |  |  | $ | 2 |  |  | $ | (3) |
Schedule of benefit obligations in excess of fair value of plan assets | The following table presents aggregated information for those individual defined benefit pension plans that have an ABO in excess of plan assets as of December 31, which, for 2021, excludes the three North American defined benefit pension plans and, for 2020, excludes two of the North American defined benefit pension plans, as each has plan assets in excess of its ABO:
| North America |  | United Kingdom
| 2021 |  | 2020 |  | 2021 |  | 2020
| (in millions)
Accumulated benefit obligation | $ | — |  |  | $ | (678) |  |  | $ | (590) |  |  | $ | (643) |
Fair value of plan assets | — |  |  | 667 |  |  | 505 |  |  | 491 |
The following table presents aggregated information for those individual defined benefit pension plans that have a projected benefit obligation (PBO) in excess of plan assets as of December 31, which excludes two North American defined benefit pension plans that have plan assets in excess of its PBO:
| North America |  | United Kingdom
| 2021 |  | 2020 |  | 2021 |  | 2020
| (in millions)
Projected benefit obligation | $ | (684) |  |  | $ | (715) |  |  | (590) |  |  | $ | (643) |
Fair value of plan assets | 656 |  |  | 667 |  |  | 505 |  |  | 491 |
Schedule of expected future pension and retiree medical benefit payments | The expected future benefit payments for our pension and retiree medical plans are as follows:
| Pension Plans |  | Retiree Medical Plans
| North America |  | United Kingdom |  | North America
| (in millions)
2022 | $ | 47 |  |  | $ | 28 |  |  | $ | 3 |
2023 | 48 |  |  | 28 |  |  | 2 |
2024 | 49 |  |  | 29 |  |  | 2 |
2025 | 49 |  |  | 30 |  |  | 2 |
2026 | 50 |  |  | 31 |  |  | 2 |
2027-2031 | 253 |  |  | 167 |  |  | 9 |
Schedule of assumptions used in determining the benefit obligations and expense | The following assumptions were used in determining the benefit obligations and expense:
| Pension Plans |  |  |  |  |  | Retiree Medical Plans
| North America |  | United Kingdom |  |  |  | North America
| 2021 |  | 2020 |  | 2019 |  | 2021 |  | 2020 |  | 2019 |  |  |  |  |  | 2021 |  | 2020 |  | 2019
Weighted-average discount rate—obligation | 2.8 | % |  | 2.4 | % |  | 3.1 | % |  | 2.0 | % |  | 1.5 | % |  | 2.0 | % |  |  |  |  |  | 2.7 | % |  | 2.2 | % |  | 3.0 | %
Weighted-average discount rate—expense | 2.4 | % |  | 3.1 | % |  | 4.1 | % |  | 1.5 | % |  | 2.0 | % |  | 2.9 | % |  |  |  |  |  | 2.2 | % |  | 3.0 | % |  | 4.1 | %
Weighted-average cash balance interest crediting rate—obligation | 3.0 | % |  | 3.0 | % |  | 3.0 | % |  | n/a |  | n/a |  | n/a |  |  |  |  |  | n/a |  | n/a |  | n/a
Weighted-average cash balance interest crediting rate—expense | 3.0 | % |  | 3.0 | % |  | 3.0 | % |  | n/a |  | n/a |  | n/a |  |  |  |  |  | n/a |  | n/a |  | n/a
Weighted-average rate of increase in future compensation | 4.2 | % |  | 4.2 | % |  | 4.2 | % |  | n/a |  | n/a |  | n/a |  |  |  |  |  | n/a |  | n/a |  | n/a
Weighted-average expected long-term rate of return on assets—expense | 3.2 | % |  | 4.1 | % |  | 4.6 | % |  | 3.3 | % |  | 3.4 | % |  | 4.4 | % |  |  |  |  |  | n/a |  | n/a |  | n/a
Weighted-average retail price index—obligation | n/a |  | n/a |  | n/a |  | 3.3 | % |  | 3.0 | % |  | 3.0 | % |  |  |  |  |  | n/a |  | n/a |  | n/a
Weighted-average retail price index—expense | n/a |  | n/a |  | n/a |  | 3.0 | % |  | 3.0 | % |  | 3.3 | % |  |  |  |  |  | n/a |  | n/a |  | n/a
______________________________________________________________________________ n/a—not applicable
Schedule of fair values of U.S. and Canadian pension plan assets | The fair values of our pension plan assets as of December 31, 2021 and 2020, by major asset class, are as follows:
| North America |  |  |
| December 31, 2021
| Total Fair Value |  | Quoted Prices in Active Markets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  |  |
| (in millions) |  |  |
Cash and cash equivalents(1) | $ | 14 |  |  | $ | 10 |  |  | $ | 4 |  |  | $ | — |  |  |  |
Equity mutual funds |  |  |  |  |  |  |  |  |  |
Index equity(2) | 157 |  |  | 157 |  |  | — |  |  | — |  |  |  |
Pooled equity(3) | 34 |  |  | — |  |  | 34 |  |  | — |  |  |  |
Fixed income |  |  |  |  |  |  |  |  |  |
U.S. Treasury bonds and notes(4) | 61 |  |  | 61 |  |  | — |  |  | — |  |  |  |
Corporate bonds and notes(5) | 460 |  |  | — |  |  | 460 |  |  | — |  |  |  |
Government and agency securities(6) | 103 |  |  | — |  |  | 103 |  |  | — |  |  |  |
Other(7) | 7 |  |  | — |  |  | 7 |  |  | — |  |  |  |
Total assets at fair value by fair value levels | $ | 836 |  |  | $ | 228 |  |  | $ | 608 |  |  | $ | — |  |  |  |
Accruals and payables—net | (6) |  |  |  |  |  |  |  |  |  |
Total assets | $ | 830 |  |  |  |  |  |  |  |  |  |
| United Kingdom |  |  |
| December 31, 2021
| Total Fair Value |  | Quoted Prices in Active Markets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  |  |
| (in millions) |  |  |
Cash and cash funds(8) | $ | 15 |  |  | $ | 8 |  |  | $ | 7 |  |  | $ | — |  |  |  |
Pooled equity funds(9) | 122 |  |  | — |  |  | 122 |  |  | — |  |  |  |
Pooled diversified funds(10) | 52 |  |  | — |  |  | 52 |  |  | — |  |  |  |
Debt funds |  |  |  |  |  |  |  |  |  |
Pooled U.K. government fixed and index-linked securities funds(11) | 78 |  |  | — |  |  | 78 |  |  | — |  |  |  |
Pooled global debt funds(12) | 88 |  |  | — |  |  | 88 |  |  | — |  |  |  |
Pooled liability-driven investment funds(13) | 67 |  |  | — |  |  | 67 |  |  | — |  |  |  |
Total assets at fair value by fair value levels | $ | 422 |  |  | $ | 8 |  |  | $ | 414 |  |  | $ | — |  |  |  |
Funds measured at NAV as a practical expedient(14) | 83 |  |  |  |  |  |  |  |  |  |
Total assets | $ | 505 |  |  |  |  |  |  |  |  |  |
| North America
| December 31, 2020
| Total Fair Value |  | Quoted Prices in Active Markets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
| (in millions)
Cash and cash equivalents(1) | $ | 30 |  |  | $ | 7 |  |  | $ | 23 |  |  | $ | — |
Equity mutual funds |  |  |  |  |  |  |
Index equity(2) | 134 |  |  | 134 |  |  | — |  |  | — |
Pooled equity(3) | 30 |  |  | — |  |  | 30 |  |  | — |
Fixed income |  |  |  |  |  |  |
U.S. Treasury bonds and notes(4) | 37 |  |  | 37 |  |  | — |  |  | — |
Corporate bonds and notes(5) | 499 |  |  | — |  |  | 499 |  |  | — |
Government and agency securities(6) | 110 |  |  | — |  |  | 110 |  |  | — |
Other(7) | 7 |  |  | — |  |  | 7 |  |  | — |
Total assets at fair value by fair value levels | $ | 847 |  |  | $ | 178 |  |  | $ | 669 |  |  | $ | — |
Accruals and payables—net | (1) |  |  |  |  |  |  |
Total assets | $ | 846 |  |  |  |  |  |  |
| United Kingdom |  |  |
| December 31, 2020
| Total Fair Value |  | Quoted Prices in Active Markets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  |  |
| (in millions) |  |  |
Cash and cash funds(8) | $ | 22 |  |  | $ | 5 |  |  | $ | 17 |  |  | $ | — |  |  |  |
Pooled equity funds(9) | 118 |  |  | — |  |  | 118 |  |  | — |  |  |  |
Pooled diversified funds(10) | 55 |  |  | — |  |  | 55 |  |  | — |  |  |  |
Debt funds |  |  |  |  |  |  |  |  |  |
Pooled U.K. government fixed and index-linked securities funds(11) | 73 |  |  | — |  |  | 73 |  |  | — |  |  |  |
Pooled global debt funds(12) | 88 |  |  | — |  |  | 88 |  |  | — |  |  |  |
Pooled liability-driven investment funds(13) | 83 |  |  | — |  |  | 83 |  |  | — |  |  |  |
Total assets at fair value by fair value levels | $ | 439 |  |  | $ | 5 |  |  | $ | 434 |  |  | $ | — |  |  |  |
Funds measured at NAV as a practical expedient(14) | 52 |  |  |  |  |  |  |  |  |  |
Total assets | $ | 491 |  |  |  |  |  |  |  |  |  |
_______________________________________________________________________________ (1)Cash and cash equivalents are primarily short-term U.S. treasury bills and short-term money market funds in 2021, and also included repurchase agreements in 2020. (2)The index equity funds are mutual funds that utilize a passively managed investment approach designed to track specific equity indices. They are valued at quoted market prices in an active market, which represent the net asset values of the shares held by the plan. (3)The equity pooled mutual funds consist of pooled funds that invest in common stock and other equity securities that are traded on U.S., Canadian, and foreign markets. (4)U.S. Treasury bonds and notes are valued based on quoted market prices in an active market. (5)Corporate bonds and notes, including private placement securities, are valued by institutional bond pricing services, which gather information from market sources and integrate credit information, observed market movements and sector news into their pricing applications and models. (6)Government and agency securities consist of U.S. municipal bonds and Canadian provincial bonds that are valued by institutional bond pricing services, which gather information on current trading activity, market movements, trends, and specific data on specialty issues. (7)Other includes primarily mortgage-backed and asset-backed securities, which are valued by institutional pricing services, which gather information from market sources and integrate credit information, observed market movements and sector news into their pricing applications and models. (8)Cash and cash funds include a cash fund that holds primarily short-dated term money market securities. (9)Pooled equity funds invest in a broad array of global equity, equity-related securities, a range of diversifiers and may use derivatives for efficient portfolio management. The funds are valued at net asset value (NAV) as determined by the fund managers based on the value of the underlying net assets of the fund. (10)Pooled diversified funds invest in a broad array of asset classes and a range of diversifiers including the use of derivatives. The funds are valued at NAV as determined by the fund managers based on the value of the underlying net assets of the fund. (11)Pooled U.K. government fixed and index-linked securities funds invest primarily in Sterling denominated fixed income and inflation-linked fixed income securities issued or guaranteed by the U.K. government and may use derivatives for efficient portfolio management. The funds are valued at NAV as determined by the fund managers based on the value of the underlying net assets of the fund. (12)Pooled global debt funds invest in a broad array of debt securities from corporate and government bonds to emerging markets and high-yield fixed and floating rate securities of varying maturities. The funds are valued at NAV as determined by the fund managers based on the value of the underlying net assets of the fund. (13)Pooled liability-driven investment funds invest primarily in gilt repurchase agreements, physical U.K. government gilts, and derivatives to provide exposure to interest rates and inflation, thus hedging these elements of risk associated with pension liabilities. The funds are valued at NAV as determined by the fund managers based on the value of the underlying net assets of the fund. (14)Funds measured at NAV as a practical expedient include funds of funds with return strategies with exposure to varying asset classes and credit strategies, as well as alternative investment strategies not precluding multi-asset credit strategies, global macro strategies, commodities, fixed income, equities and currency, and funds that invest primarily in freehold and leasehold property in the United Kingdom. The funds are valued using NAV as determined by the fund managers based on the value of the underlying assets of the fund.

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments and other amounts recognized in accumulated other comprehensive income (loss). + References No definition available. + Details
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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + 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 (d)(5) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized. + 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 (c) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of assumption used to determine benefit obligation and net periodic benefit cost of defined benefit plan. Includes, but is not limited to, discount rate, rate of compensation increase, expected long-term rate of return on plan assets and interest crediting rate. + 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 (k) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of benefit obligation and plan assets for defined benefit pension plan with projected benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2417-114920 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=123450688&loc=d3e4179-114921 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + 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 (f) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the amounts related to pension plans and/or other employee benefit plans in accumulated other comprehensive income or loss that have not yet been recognized as components of net periodic benefit cost, such as the net gain (loss), net prior service cost or credit, and net transition asset or obligation. + 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 (j) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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