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Retirement Plans (Retirement Plans, Funded Status) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expense for the defined contribution plans for continuing operations |  | $ 100 | $ 206 | $ 193
Foreign Plan [Member] |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Benefit obligation at end of period |  | 1,200 | 1,100 |
Fair value of plan assets at end of period |  | 1,077 | 1,002 |
Funded status at end of period |  | 152 | 111 |
Defined Benefit Plan, Accumulated Benefit Obligation |  | 1,100 | 1,000 |
Amounts recognized on the Consolidated Balance Sheets |  |  |  |
Other Assets |  | 45 | 85 |
Accrued employee compensation and benefits |  | 8 | 7 |
Employee compensation and benefits |  | 189 | 189 |
Pension plans in which projected benefit obligation exceeded plan assets |  |  |  |
Projected benefit obligation |  | 228 | 214 |
Fair value of plan assets |  | 31 | 18 |
Pension plans in which accumulated benefit obligation exceeded plan assets |  |  |  |
Accumulated benefit obligation |  | 126 | 121 |
Fair value of plan assets |  | 25 | 18 |
Foreign Plan [Member] | Cash and equivalents |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period |  | 136 | 151 |
Foreign Plan [Member] | Equity funds |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [1] | 170 | 118 |
Foreign Plan [Member] | Bond funds |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [2] | 468 | 391 |
Foreign Plan [Member] | Alternatives fund |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [3] | 167 | 197 |
Foreign Plan [Member] | Real estate funds |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [4] | 96 | 103 |
Foreign Plan [Member] | Other investments |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [5] | 40 | 42 |
Foreign Plan [Member] | Level 1 |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period |  | 5 | 6 |
Foreign Plan [Member] | Level 1 | Cash and equivalents |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period |  | 0 | 0 |
Foreign Plan [Member] | Level 1 | Equity funds |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [1] | 0 | 0 |
Foreign Plan [Member] | Level 1 | Bond funds |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [2] | 0 | 0 |
Foreign Plan [Member] | Level 1 | Alternatives fund |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [3] | 0 | 0 |
Foreign Plan [Member] | Level 1 | Real estate funds |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [4] | 0 | 0 |
Foreign Plan [Member] | Level 1 | Other investments |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [5] | 5 | 6 |
Foreign Plan [Member] | Level 2 |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period |  | 718 | 656 |
Foreign Plan [Member] | Level 2 | Cash and equivalents |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period |  | 136 | 151 |
Foreign Plan [Member] | Level 2 | Equity funds |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [1] | 170 | 118 |
Foreign Plan [Member] | Level 2 | Bond funds |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [2] | 319 | 292 |
Foreign Plan [Member] | Level 2 | Alternatives fund |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [3] | 4 | 0 |
Foreign Plan [Member] | Level 2 | Real estate funds |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [4] | 68 | 74 |
Foreign Plan [Member] | Level 2 | Other investments |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [5] | 21 | 21 |
Foreign Plan [Member] | Level 3 |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period |  | 14 | 15 |
Foreign Plan [Member] | Level 3 | Cash and equivalents |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period |  | 0 | 0 |
Foreign Plan [Member] | Level 3 | Equity funds |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [1] | 0 | 0 |
Foreign Plan [Member] | Level 3 | Bond funds |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [2] | 0 | 0 |
Foreign Plan [Member] | Level 3 | Alternatives fund |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [3] | 0 | 0 |
Foreign Plan [Member] | Level 3 | Real estate funds |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [4] | 0 | 0 |
Foreign Plan [Member] | Level 3 | Other investments |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [5] | 14 | 15 |
Foreign Plan [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [6] | 340 | 325 |
Foreign Plan [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Cash and equivalents |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [6] | 0 | 0 |
Foreign Plan [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Equity funds |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [1],[6] | 0 | 0 |
Foreign Plan [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Bond funds |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [2],[6] | 149 | 99 |
Foreign Plan [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Alternatives fund |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [3],[6] | 163 | 197 |
Foreign Plan [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Real estate funds |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [4],[6] | 28 | 29 |
Foreign Plan [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Other investments |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [5],[6] | $ 0 | $ 0 |
United Kingdom Pension Plan [Member] |  |  |  |
Pension plans in which accumulated benefit obligation exceeded plan assets |  |  |  |
United Kingdom pension plan percentage of international pension plans' projected benefit obligations |  | 81.00% |  |
[1] | Strategy of equity funds is to invest in diversified funds of global common stocks.
[2] | Strategy of bond funds is to invest in diversified funds of fixed income securities of varying geographies and credit quality.
[3] | Strategy of alternative funds is to invest in a fund of diversifying investments, including but not limited to reinsurance, commodities, and currencies.
[4] | Strategy of real estate funds is to invest in diversified funds of real estate investment trusts and private real estate.
[5] | Other investments primarily include investments in insurance contracts, balanced funds, and government bonds.
[6] | Represents investments measured at fair value using the Net Asset Value (NAV) per share practical expedient and thus has not been categorized in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the total value of our international pension plans assets.

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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