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Equity, Income Tax Effects on Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Before-Tax Amount |  |  |
Other comprehensive income (loss) before income tax expense (benefit) | $ 83 | $ 107 | $ (468)
Tax Expense (Benefit) |  |  |
Income tax expense (benefit) related to items of other comprehensive income (loss) | (16) | (48) | 10
Net Amount |  |  |
Other comprehensive income (loss) | 99 | 155 | (478)
Foreign Currency Translation Adjustment [Member] |  |  |
Before-Tax Amount |  |  |
Other comprehensive income (loss), before reclassifications, before tax | 161 | 349 | (517)
Tax Expense (Benefit) |  |  |
Other comprehensive income (loss), before reclassifications, tax expense (benefit) | 0 | 0 | 0
Net Amount |  |  |
Other comprehensive income (loss), before reclassifications, net of tax | 161 | 349 | (517)
Net Gain (Loss) on Pension and Other Postretirement Benefits [Member] |  |  |
Before-Tax Amount |  |  |
Other comprehensive income (loss) before income tax expense (benefit) | (80) | (234) | 49
Tax Expense (Benefit) |  |  |
Income tax expense (benefit) related to items of other comprehensive income (loss) | (15) | (47) | 10
Net Amount |  |  |
Other comprehensive income (loss) | (65) | (187) | 39
Net Actuarial Gain (Loss) [Member] |  |  |
Before-Tax Amount |  |  |
Other comprehensive income (loss), before reclassifications, before tax | (128) | (245) | 1
Reclassification from accumulated other comprehensive loss, current period, before tax | 74 | 38 | 63
Tax Expense (Benefit) |  |  |
Other comprehensive income (loss), before reclassifications, tax expense (benefit) | (26) | (54) | 0
Reclassification from accumulated other comprehensive loss, current period, tax expense (benefit) | 17 | 9 | 14
Net Amount |  |  |
Other comprehensive income (loss), before reclassifications, net of tax | (102) | (191) | 1
Reclassification from accumulated other comprehensive loss, current period, net of tax | 57 | 29 | 49
Prior Service Cost (Credit) [Member] |  |  |
Before-Tax Amount |  |  |
Other comprehensive income (loss), before reclassifications, before tax | (5) | (3) | 7
Reclassification from accumulated other comprehensive loss, current period, before tax | (26) | (28) | (29)
Tax Expense (Benefit) |  |  |
Other comprehensive income (loss), before reclassifications, tax expense (benefit) | (1) | (1) | 1
Reclassification from accumulated other comprehensive loss, current period, tax expense (benefit) | (6) | (6) | (7)
Net Amount |  |  |
Other comprehensive income (loss), before reclassifications, net of tax | (4) | (2) | 6
Reclassification from accumulated other comprehensive loss, current period, net of tax | (20) | (22) | (22)
Miscellaneous Loss [Member] |  |  |
Before-Tax Amount |  |  |
Other comprehensive income (loss), before reclassifications, before tax |  | 0 |
Tax Expense (Benefit) |  |  |
Other comprehensive income (loss), before reclassifications, tax expense (benefit) |  | 4 |
Net Amount |  |  |
Other comprehensive income (loss), before reclassifications, net of tax |  | (4) |
Curtailment and Settlement Loss [Member] |  |  |
Before-Tax Amount |  |  |
Reclassification from accumulated other comprehensive loss, current period, before tax | 5 | 4 | 7
Tax Expense (Benefit) |  |  |
Reclassification from accumulated other comprehensive loss, current period, tax expense (benefit) | 1 | 1 | 2
Net Amount |  |  |
Reclassification from accumulated other comprehensive loss, current period, net of tax | 4 | 3 | $ 5
Net Gain (Loss) from Derivative Instruments Designated and Qualifying as Cash Flow Hedges [Member] |  |  |
Before-Tax Amount |  |  |
Other comprehensive income (loss), before reclassifications, before tax | 36 | (6) |
Reclassification from accumulated other comprehensive loss, current period, before tax | (34) | (2) |
Other comprehensive income (loss) before income tax expense (benefit) | 2 | (8) |
Tax Expense (Benefit) |  |  |
Other comprehensive income (loss), before reclassifications, tax expense (benefit) | 3 | (1) |
Reclassification from accumulated other comprehensive loss, current period, tax expense (benefit) | (4) | 0 |
Income tax expense (benefit) related to items of other comprehensive income (loss) | (1) | (1) |
Net Amount |  |  |
Other comprehensive income (loss), before reclassifications, net of tax | 33 | (5) |
Reclassification from accumulated other comprehensive loss, current period, net of tax | (30) | (2) |
Other comprehensive income (loss) | $ 3 | $ (7) |

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