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Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2019
Pension Plans |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Projected Benefit Obligations, Plan Assets and Funded Status of Pension Plans | The projected benefit obligations, plan assets and funded status of our pension plans were:
| U.S. Plans |  | Non-U.S. Plans
| 2019 |  | 2018 |  | 2019 |  | 2018
| (in millions)
Projected benefit obligation at January 1 | $ | 1,511 |  |  | $ | 1,762 |  |  | $ | 9,578 |  |  | $ | 10,852 |
Service cost | 38 |  |  | 43 |  |  | 122 |  |  | 146 |
Interest cost | 60 |  |  | 61 |  |  | 202 |  |  | 199 |
Benefits paid | (40 | ) |  | (29 | ) |  | (424 | ) |  | (462 | )
Settlements paid | (73 | ) |  | (118 | ) |  | (1 | ) |  | (2 | )
Actuarial (gains)/losses | 251 |  |  | (208 | ) |  | 761 |  |  | (640 | )
Currency | — |  |  | — |  |  | 207 |  |  | (528 | )
Other | 1 |  |  | — |  |  | 13 |  |  | 13 |
Projected benefit obligation at December 31 | 1,748 |  |  | 1,511 |  |  | 10,458 |  |  | 9,578 |
Fair value of plan assets at January 1 | 1,510 |  |  | 1,717 |  |  | 8,465 |  |  | 9,327 |
Actual return on plan assets | 334 |  |  | (99 | ) |  | 1,211 |  |  | (243 | )
Contributions | 8 |  |  | 39 |  |  | 261 |  |  | 323 |
Benefits paid | (40 | ) |  | (29 | ) |  | (424 | ) |  | (462 | )
Settlements paid | (73 | ) |  | (118 | ) |  | (1 | ) |  | (2 | )
Currency | — |  |  | — |  |  | 246 |  |  | (478 | )
Fair value of plan assets at December 31 | 1,739 |  |  | 1,510 |  |  | 9,758 |  |  | 8,465 |
Net pension (liabilities)/assets at December 31 | $ | (9 | ) |  | $ | (1 | ) |  | $ | (700 | ) |  | $ | (1,113 | )
Schedule of Pension Plans Resulted in Net Pension Liability | The combined U.S. and non-U.S. pension plans resulted in a net pension liability of $709 million at December 31, 2019 and $1,114 million at December 31, 2018. We recognized these amounts in our consolidated balance sheets as follows:
| As of December 31,
| 2019 |  | 2018
| (in millions)
Prepaid pension assets | $ | 516 |  |  | $ | 132 |
Other current liabilities | (35 | ) |  | (25 | )
Accrued pension costs | (1,190 | ) |  | (1,221 | )
| $ | (709 | ) |  | $ | (1,114 | )
Schedule of Projected Benefit Obligations, Accumulated Benefit Obligations and Fair Value of Plan Assets | Certain of our U.S. and non-U.S. plans are underfunded with accumulated benefit obligations in excess of plan assets. For these plans, the projected benefit obligations, accumulated benefit obligations and the fair value of plan assets were:
| U.S. Plans |  | Non-U.S. Plans
| As of December 31, |  | As of December 31,
| 2019 |  | 2018 |  | 2019 |  | 2018
| (in millions)
Projected benefit obligation | $ | 55 |  |  | $ | 52 |  |  | $ | 3,613 |  |  | $ | 3,343 |
Accumulated benefit obligation | 55 |  |  | 50 |  |  | 3,447 |  |  | 3,194 |
Fair value of plan assets | 2 |  |  | 2 |  |  | 2,443 |  |  | 2,169 |
Schedule of Weighted-Average Assumptions Used to Determine Benefit Obligations | We used the following weighted-average assumptions to determine our benefit obligations under the pension plans:
| U.S. Plans |  | Non-U.S. Plans
| As of December 31, |  | As of December 31,
| 2019 |  | 2018 |  | 2019 |  | 2018
Discount rate | 3.44 | % |  | 4.40 | % |  | 1.74 | % |  | 2.45 | %
Expected rate of return on plan assets | 5.00 | % |  | 5.75 | % |  | 4.20 | % |  | 4.80 | %
Rate of compensation increase | 4.00 | % |  | 4.00 | % |  | 3.17 | % |  | 3.31 | %
We used the following weighted-average assumptions to determine our net periodic pension cost:
| U.S. Plans |  | Non-U.S. Plans
| For the Years Ended December 31, |  | For the Years Ended December 31,
| 2019 |  | 2018 |  | 2017 |  | 2019 |  | 2018 |  | 2017
Discount rate | 4.40 | % |  | 3.68 | % |  | 4.19 | % |  | 2.45 | % |  | 2.20 | % |  | 2.31 | %
Expected rate of return on plan assets | 5.75 | % |  | 5.50 | % |  | 6.25 | % |  | 4.80 | % |  | 4.90 | % |  | 5.14 | %
Rate of compensation increase | 4.00 | % |  | 4.00 | % |  | 4.00 | % |  | 3.31 | % |  | 3.31 | % |  | 3.29 | %
Schedule of Components of Net Costs | Net periodic pension cost consisted of the following:
| U.S. Plans |  | Non-U.S. Plans
| For the Years Ended December 31, |  | For the Years Ended December 31,
| 2019 |  | 2018 |  | 2017 |  | 2019 |  | 2018 |  | 2017
| (in millions)
Service cost | $ | 38 |  |  | $ | 43 |  |  | $ | 46 |  |  | $ | 122 |  |  | $ | 146 |  |  | $ | 156 |
Interest cost | 60 |  |  | 61 |  |  | 62 |  |  | 202 |  |  | 199 |  |  | 199 |
Expected return on plan assets | (88 | ) |  | (88 | ) |  | (101 | ) |  | (404 | ) |  | (448 | ) |  | (434 | )
Amortization: |  |  |  |  |  |  |  |  |  |  |
Net loss from experience differences | 30 |  |  | 32 |  |  | 37 |  |  | 148 |  |  | 163 |  |  | 167 |
Prior service cost/(benefit) | 1 |  |  | 2 |  |  | 2 |  |  | (6 | ) |  | (2 | ) |  | (3 | )
Settlement losses and other expenses (1) | 16 |  |  | 35 |  |  | 35 |  |  | (3 | ) |  | 5 |  |  | 6 |
Net periodic pension cost | $ | 57 |  |  | $ | 85 |  |  | $ | 81 |  |  | $ | 59 |  |  | $ | 63 |  |  | $ | 91 |
(1) Settlement losses of $5 million in 2019, $5 million in 2018 and $11 million in 2017 were incurred in connection with our Simplify to Grow Program. See Note 8, Restructuring Program, for more information. Net settlement losses of $12 million for our U.S. plans and settlement gains of $4 million for our non-U.S. plans in 2019, and settlement losses of $31 million for our U.S. plans and $4 million for our non-U.S. plans in 2018 and $21 million for our U.S. plans and $6 million for our non-U.S. plans in 2017 related to lump-sum payment elections made by retired employees.
Schedule of Changes in Level 3 Plan Assets | Changes in our Level 3 plan assets, which are recorded in other comprehensive earnings/(losses), included:
Asset Category |  | January 1, 2019 Balance |  | Net Realized and Unrealized Gains/ (Losses) |  | Net Purchases, Issuances and Settlements |  | Net Transfers Into/(Out of) Level 3 |  | Currency Impact |  | December 31, 2019 Balance
|  | (in millions)
Corporate bond and other fixed-income securities |  | $ | 1,032 |  |  | $ | 8 |  |  | $ | 727 |  |  | $ | — |  |  | $ | 69 |  |  | $ | 1,836 |
Real estate |  | 22 |  |  | 36 |  |  | 3 |  |  | — |  |  | 1 |  |  | 62 |
Private equity and other |  | 3 |  |  | 1 |  |  | — |  |  | — |  |  | — |  |  | 4 |
Total Level 3 investments |  | $ | 1,057 |  |  | $ | 45 |  |  | $ | 730 |  |  | $ | — |  |  | $ | 70 |  |  | $ | 1,902 |
Asset Category |  | January 1, 2018 Balance |  | Net Realized and Unrealized Gains/ (Losses) |  | Net Purchases, Issuances and Settlements |  | Net Transfers Into/(Out of) Level 3 |  | Currency Impact |  | December 31, 2018 Balance
|  | (in millions)
Corporate bond and other fixed-income securities |  | $ | 790 |  |  | $ | 62 |  |  | $ | 236 |  |  | $ | — |  |  | $ | (56 | ) |  | $ | 1,032 |
Real estate |  | 23 |  |  | 1 |  |  | (1 | ) |  | — |  |  | (1 | ) |  | 22 |
Private equity and other |  | 3 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 3 |
Total Level 3 investments |  | $ | 816 |  |  | $ | 63 |  |  | $ | 235 |  |  | $ | — |  |  | $ | (57 | ) |  | $ | 1,057 |
Schedule of Fair Values of Pension Plan Assets | The percentage of fair value of pension plan assets was:
|  | U.S. Plans |  | Non-U.S. Plans
|  | As of December 31, |  | As of December 31,
Asset Category |  | 2019 |  | 2018 |  | 2019 |  | 2018
Equity securities |  | 15 | % |  | 15 | % |  | 26 | % |  | 26 | %
Fixed-income securities |  | 85 | % |  | 85 | % |  | 54 | % |  | 59 | %
Real estate |  | — |  |  | — |  |  | 6 | % |  | 6 | %
Hedge funds |  | — |  |  | — |  |  | 1 | % |  | 2 | %
Buy-in annuity policies |  | — |  |  | — |  |  | 12 | % |  | 6 | %
Cash |  | — |  |  | — |  |  | 1 | % |  | 1 | %
Total |  | 100 | % |  | 100 | % |  | 100 | % |  | 100 | %
The fair value of pension plan assets was determined using the following fair value measurements:
|  | As of December 31, 2019
Asset Category |  | Total Fair Value |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
|  | (in millions)
U.S. equity securities |  | $ | 2 |  |  | $ | 2 |  |  | $ | — |  |  | $ | — |
Non-U.S. equity securities |  | 2 |  |  | 2 |  |  | — |  |  | — |
Pooled funds - equity securities |  | 2,186 |  |  | 890 |  |  | 1,296 |  |  | — |
Total equity securities |  | 2,190 |  |  | 894 |  |  | 1,296 |  |  | — |
Government bonds |  | 3,328 |  |  | 53 |  |  | 3,275 |  |  | — |
Pooled funds - fixed-income securities |  | 575 |  |  | 417 |  |  | 158 |  |  | — |
Corporate bonds and other fixed-income securities |  | 2,727 |  |  | 66 |  |  | 825 |  |  | 1,836 |
Total fixed-income securities |  | 6,630 |  |  | 536 |  |  | 4,258 |  |  | 1,836 |
Real estate |  | 186 |  |  | 124 |  |  | — |  |  | 62 |
Private equity |  | 3 |  |  | — |  |  | — |  |  | 3 |
Cash |  | 122 |  |  | 117 |  |  | 5 |  |  | — |
Other |  | 2 |  |  | 1 |  |  | — |  |  | 1 |
Total assets in the fair value hierarchy |  | $ | 9,133 |  |  | $ | 1,672 |  |  | $ | 5,559 |  |  | $ | 1,902 |
Investments measured at net asset value |  | 2,297 |  |  |  |  |  |  |
Total investments at fair value |  | $ | 11,430 |  |  |  |  |  |  |
|  | As of December 31, 2018
Asset Category |  | Total Fair Value |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
|  | (in millions)
U.S. equity securities |  | $ | 2 |  |  | $ | 2 |  |  | $ | — |  |  | $ | — |
Non-U.S. equity securities |  | 5 |  |  | 5 |  |  | — |  |  | — |
Pooled funds - equity securities |  | 1,951 |  |  | 743 |  |  | 1,208 |  |  | — |
Total equity securities |  | 1,958 |  |  | 750 |  |  | 1,208 |  |  | — |
Government bonds |  | 3,156 |  |  | 62 |  |  | 3,094 |  |  | — |
Pooled funds - fixed-income securities |  | 573 |  |  | 429 |  |  | 144 |  |  | — |
Corporate bonds and other fixed-income securities |  | 2,050 |  |  | 87 |  |  | 931 |  |  | 1,032 |
Total fixed-income securities |  | 5,779 |  |  | 578 |  |  | 4,169 |  |  | 1,032 |
Real estate |  | 130 |  |  | 108 |  |  | — |  |  | 22 |
Private equity |  | 2 |  |  | — |  |  | — |  |  | 2 |
Cash |  | 44 |  |  | 32 |  |  | 12 |  |  | — |
Other |  | 2 |  |  | 1 |  |  | — |  |  | 1 |
Total assets in the fair value hierarchy |  | $ | 7,915 |  |  | $ | 1,469 |  |  | $ | 5,389 |  |  | $ | 1,057 |
Investments measured at net asset value |  | 1,993 |  |  |  |  |  |  |
Total investments at fair value |  | $ | 9,908 |  |  |  |  |  |  |
Schedule of Estimated Future Benefit Payments | The estimated future benefit payments from our pension plans at December 31, 2019 were (in millions):
| 2020 |  | 2021 |  | 2022 |  | 2023 |  | 2024 |  | 2025-2029
U.S. Plans | $ | 167 |  |  | $ | 102 |  |  | $ | 105 |  |  | $ | 105 |  |  | $ | 108 |  |  | $ | 513 |
Non-U.S. Plans | 380 |  |  | 376 |  |  | 385 |  |  | 395 |  |  | 403 |  |  | 2,126 |
Postretirement Health Care Plan |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Weighted-Average Assumptions Used to Determine Benefit Obligations | We used the following weighted-average assumptions to determine our net periodic postretirement health care cost:
| U.S. Plans |  | Non-U.S. Plans
| For the Years Ended December 31, |  | For the Years Ended December 31,
| 2019 |  | 2018 |  | 2017 |  | 2019 |  | 2018 |  | 2017
Discount rate | 4.37% |  | 3.66% |  | 4.14% |  | 4.40% |  | 4.24% |  | 4.55%
Health care cost trend rate | 6.25% |  | 6.25% |  | 6.50% |  | 5.44% |  | 5.56% |  | 5.50%
Schedule of Components of Net Costs | Net periodic postretirement health care costs consisted of the following:
| For the Years Ended December 31,
| 2019 |  | 2018 |  | 2017
| (in millions)
Service cost | $ | 5 |  |  | $ | 6 |  |  | $ | 7 |
Interest cost | 15 |  |  | 14 |  |  | 15 |
Amortization: |  |  |  |  |
Net loss from experience differences | 6 |  |  | 15 |  |  | 14 |
Prior service credit | (38 | ) |  | (39 | ) |  | (40 | )
Net periodic postretirement health care costs/(benefit) | $ | (12 | ) |  | $ | (4 | ) |  | $ | (4 | )
Schedule of Estimated Future Benefit Payments | Our estimated future benefit payments for our postretirement health care plans at December 31, 2019 were (in millions):
| 2020 |  | 2021 |  | 2022 |  | 2023 |  | 2024 |  | 2025-2029
U.S. Plans | $ | 11 |  |  | $ | 12 |  |  | $ | 13 |  |  | $ | 14 |  |  | $ | 15 |  |  | $ | 74 |
Non-U.S. Plans | 5 |  |  | 5 |  |  | 5 |  |  | 6 |  |  | 6 |  |  | 32 |
Schedule of Changes in Accumulated Postemployment Benefit Obligations | Our postretirement health care plans are not funded. The changes in and the amount of the accrued benefit obligation were:
| As of December 31,
| 2019 |  | 2018
| (in millions)
Accrued benefit obligation at January 1 | $ | 366 |  |  | $ | 435 |
Service cost | 5 |  |  | 6 |
Interest cost | 15 |  |  | 15 |
Benefits paid | (16 | ) |  | (19 | )
Currency | 5 |  |  | (11 | )
Assumption changes | 34 |  |  | (39 | )
Actuarial losses/(gains) | (6 | ) |  | (21 | )
Accrued benefit obligation at December 31 | $ | 403 |  |  | $ | 366 |
Schedule of Weighted-Average Assumptions to Determine Benefit Obligations | We used the following weighted-average assumptions to determine our postretirement benefit obligations:
| U.S. Plans |  | Non-U.S. Plans
| As of December 31, |  | As of December 31,
| 2019 |  | 2018 |  | 2019 |  | 2018
Discount rate | 3.41 | % |  | 4.37 | % |  | 3.86 | % |  | 4.40 | %
Health care cost trend rate assumed for next year | 6.00 | % |  | 6.25 | % |  | 5.42 | % |  | 5.44 | %
Ultimate trend rate | 5.00 | % |  | 5.00 | % |  | 5.42 | % |  | 5.44 | %
Year that the rate reaches the ultimate trend rate | 2024 |  |  | 2024 |  |  | 2019 |  |  | 2018 |
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates | A one-percentage-point change in assumed health care cost trend rates would have the following effects:
| As of December 31, 2019
| One-Percentage-Point
| Increase |  | Decrease
| (in millions)
Effect on postretirement benefit obligation | $ | 39 |  |  | $ | (33 | )
Effect on annual service and interest cost | 3 |  |  | (2 | )
Postemployment Benefit Plans |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Components of Net Costs | Our postemployment plans are not funded. The changes in and the amount of the accrued benefit obligation at December 31, 2019 and 2018 were:
| As of December 31,
| 2019 |  | 2018
| (in millions)
Accrued benefit obligation at January 1 | $ | 74 |  |  | $ | 76 |
Service cost | 6 |  |  | 6 |
Interest cost | 5 |  |  | 4 |
Benefits paid | (9 | ) |  | (7 | )
Assumption changes | 3 |  |  | (1 | )
Actuarial losses/(gains) | (13 | ) |  | (4 | )
Accrued benefit obligation at December 31 | $ | 66 |  |  | $ | 74 |
Schedule of Changes in Accumulated Postemployment Benefit Obligations | Net periodic postemployment costs consisted of the following:
| For the Years Ended December 31,
| 2019 |  | 2018 |  | 2017
| (in millions)
Service cost | $ | 6 |  |  | $ | 6 |  |  | $ | 5 |
Interest cost | 5 |  |  | 4 |  |  | 4 |
Amortization of net gains | (4 | ) |  | (3 | ) |  | (3 | )
Net periodic postemployment costs | $ | 7 |  |  | $ | 7 |  |  | $ | 6 |

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