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Pension and Other Postretirement Benefits (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Multiemployer plans, additional expense | $ 6 | $ 5 | $ 5
Actuarial loss | 387 |  |
Defined benefit plan, benefit obligation, asset returns | 268 |  |
Amounts of common stock included in plan assets | 323 | 244 |
Defined benefit plan, estimated employer contributions | 22 |  |
Total contributions |  | 13 |
Pension Plan | Non-U.S. Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Actuarial loss | $ 278 | 242 |
Funding level | 100.00% |  |
Target funding level period | 6 years |  |
Percentage change of risk level commensurate | 5.00% |  |
Pension Plan | Non-U.S. Plans | Minimum |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Yearly rate of funding level decline | 4.00% |  |
Pension Plan | Non-U.S. Plans | Maximum |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Yearly rate of funding level decline | 7.00% |  |
Pension Plan | U.S. Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Actuarial loss | $ 109 | 133 |
Other Postretirement Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Actuarial loss | $ 7 | $ 14 |

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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + 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 (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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