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Benefit Plans (Fair Value of Plan Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
UNITED STATES |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | $ 1,218 | $ 1,249 | $ 1,154
UNITED STATES | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 4 | 4 |
UNITED STATES | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 1,214 | 1,245 |
UNITED STATES | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
UNITED STATES | Mutual funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 381 | 547 |
UNITED STATES | Mutual funds | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
UNITED STATES | Mutual funds | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 381 | 547 |
UNITED STATES | Mutual funds | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
UNITED STATES | Mutual funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets | [1] | 833 | 698 |
UNITED STATES | Mutual funds | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
UNITED STATES | Mutual funds | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 833 | 698 |
UNITED STATES | Mutual funds | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
UNITED STATES | Cash and Cash Equivalents [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 4 | 4 |
UNITED STATES | Cash and Cash Equivalents [Member] | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 4 | 4 |
UNITED STATES | Cash and Cash Equivalents [Member] | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
UNITED STATES | Cash and Cash Equivalents [Member] | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 106 | 112 | $ 129
Foreign Plan [Member] | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 34 | 35 |
Foreign Plan [Member] | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 69 | 74 |
Foreign Plan [Member] | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 3 | 3 |
Foreign Plan [Member] | Mutual funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 15 | 16 |
Foreign Plan [Member] | Mutual funds | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 15 | 16 |
Foreign Plan [Member] | Mutual funds | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Plan [Member] | Mutual funds | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Plan [Member] | Private equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 1 | 1 |
Foreign Plan [Member] | Private equity | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Plan [Member] | Private equity | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Plan [Member] | Private equity | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 1 | 1 |
Foreign Plan [Member] | Mutual funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets | [2] | 87 | 92 |
Foreign Plan [Member] | Mutual funds | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 18 | 18 |
Foreign Plan [Member] | Mutual funds | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 69 | 74 |
Foreign Plan [Member] | Mutual funds | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Plan [Member] | Real estate |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 1 | 1 |
Foreign Plan [Member] | Real estate | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Plan [Member] | Real estate | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Plan [Member] | Real estate | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 1 | 1 |
Foreign Plan [Member] | Other assets |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 2 | 2 |
Foreign Plan [Member] | Other assets | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 1 | 1 |
Foreign Plan [Member] | Other assets | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Plan [Member] | Other assets | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | $ 1 | $ 1 |
[1] | Mutual funds categorized as debt securities consist of mutual funds for which debt securities are the primary underlying investment
[2] | Mutual funds categorized as debt securities consist of mutual funds for which debt securities are the primary underlying investment

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