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Pension and Other Postretirement Benefit Plans (Other Changes in Plan Assets and Benefit Obligations Recognized in OCI) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plan [Line Items] |  |  |
Current year actuarial loss / (gain) | $ 78 | $ 6 | $ 102
Current year prior service cost (credit) | (156) | (9) | 5
Total recognized in other comprehensive income (loss) (pre-tax) | $ (171) | $ (52) | $ 48
Amortization of actuarial losses (in years) | 21 years |  |
Amortization of prior service credit (in years) | 13 years |  |
Other Postretirement Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plan [Line Items] |  |  |
Current year actuarial loss / (gain) | $ 9 |  |
Actuarial (loss) recognized during the year | 0 |  |
Current year prior service cost (credit) | (156) |  |
Prior service credit (cost) recognized during the year | 32 |  |
Total recognized in other comprehensive income (loss) (pre-tax) | (115) |  |
Total recognized in net periodic benefit costs and other comprehensive income (loss) (pre-tax) | (134) |  |
United States Pension Benefits | Pension Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plan [Line Items] |  |  |
Current year actuarial loss / (gain) | 0 |  |
Actuarial (loss) recognized during the year | (101) |  |
Current year prior service cost (credit) | 0 |  |
Prior service credit (cost) recognized during the year | 0 |  |
Total recognized in other comprehensive income (loss) (pre-tax) | (101) |  |
Total recognized in net periodic benefit costs and other comprehensive income (loss) (pre-tax) | (68) |  |
Foreign Pension Benefits | Pension Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plan [Line Items] |  |  |
Current year actuarial loss / (gain) | 69 |  |
Actuarial (loss) recognized during the year | (24) |  |
Current year prior service cost (credit) | 0 |  |
Prior service credit (cost) recognized during the year | 0 |  |
Total recognized in other comprehensive income (loss) (pre-tax) | 45 |  |
Total recognized in net periodic benefit costs and other comprehensive income (loss) (pre-tax) | $ 61 |  |

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