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v3.19.3.a.u2

Employee Retirement Plans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined contribution plans [Abstract] |  |  |  |
Company contributions to all defined contribution plans expensed |  | $ 1,200 | $ 1,000 | $ 1,000
Maximum age after retirement that employees may use accrued unused sick time to pay for medical and dental premiums |  | 65 years |  |
Change in benefit obligation [Roll Forward] |  |  |  |
APBO at beginning of period |  | $ 232 | 275 |
Service cost |  | 17 | 18 | 18
Interest cost |  | 10 | 9 | 11
Benefits paid |  | (9) | (5) |
Actuarial (gain)/loss |  | 38 | (69) |
Plan amendments |  | 0 | 4 |
APBO at end of period |  | 288 | 232 | 275
Estimated future benefit payments time period [Abstract] |  |  |  |
2020 |  | 9 |  |
2021 |  | 10 |  |
2022 |  | 12 |  |
2023 |  | 13 |  |
2024 |  | 15 |  |
Next five years thereafter |  | 107 |  |
Reconciliation of funded status to accrued postretirement benefit cost recognized on the balance sheet [Abstract] |  |  |  |
Funded status |  | (288) | (232) |
Unrecognized net actuarial (gain) loss |  | (24) | (64) |
Unrecognized prior service cost |  | 4 | 5 |
Accumulated other comprehensive income (loss) |  | 20 | 59 |
Cost recognized on Consolidated Balance Sheet |  | (288) | (232) |
Components of periodic postretirement benefit cost [Abstract] |  |  |  |
Service cost |  | 17 | 18 | 18
Interest cost |  | 10 | 9 | 11
Amortization of prior service cost |  | 1 | 3 | 3
Amortization of net gain |  | (2) | 0 | 0
Net periodic postretirement benefit cost |  | $ 26 | $ 30 | $ 32
Actuarial assumptions used to account for postretirement benefit plans [Abstract] |  |  |  |
Weighted-average discount rate (in hundredths) |  | 3.30% | 4.35% | 3.65%
Assumed healthcare cost trend rates [Abstract] |  |  |  |
Assumed healthcare cost trend rate decline (in hundredths) |  | 5.19% |  |
Assumed healthcare cost trend rate | [1] | 7.13% | 7.13% | 7.08%
[1] | The assumed healthcare cost trend rate is expected to be 6.79% for 2020, then decline gradually to 5.19% by 2027 and remain level thereafter.

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- Definition Maximum age after retirement that employees may use accrued unused sick time to pay for medical and dental premiums if they meet minimum levels of service and age requirements set forth by the company or as specified in collective bargaining agreements. + References No definition available. + Details
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