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Retirement Plans (Retirement Plans, Funded Status) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expense for the defined contribution plans for continuing operations |  | $ 193 | $ 173 | $ 111
Foreign Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Assets for Plan Benefits, Defined Benefit Plan |  | 39 | 2 |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Benefit obligation at end of period |  | 951 | 1,200 |
Fair value of plan assets at end of period |  | 832 | 940 |
Funded status at end of period |  | 119 | 280 |
Amounts recognized on the Consolidated Balance Sheets |  |  |  |
Accrued employee compensation and benefits |  | 8 | 15 |
Employee compensation and benefits |  | 150 | 267 |
Pension plans in which projected benefit obligation exceeded plan assets |  |  |  |
Projected benefit obligation (a) | [1] | 176 | 1,202 |
Fair value of plan assets |  | 18 | 920 |
Pension plans in which accumulated benefit obligation exceeded plan assets |  |  |  |
Accumulated benefit obligation (a) | [1] | 105 | 1,139 |
Fair value of plan assets |  | 18 | 920 |
Defined Benefit Plan, Accumulated Benefit Obligation |  | 878 | 1,200 |
Foreign Plan [Member] | Cash and Cash Equivalents [Member] |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period |  | 12 | 11 |
Foreign Plan [Member] | Equity funds (b) |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [2],[3] | 137 | 204 |
Foreign Plan [Member] | Bond funds (c) |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [2],[4] | 323 | 369 |
Foreign Plan [Member] | alternatives fund [Domain] |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [2],[5] | 209 | 184 |
Foreign Plan [Member] | Real Estate Funds [Member] |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [2],[6] | 109 | 126 |
Foreign Plan [Member] | Other assets |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period |  | 42 | 46 |
Foreign Plan [Member] | Level 1 |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period |  | 6 | 7 |
Foreign Plan [Member] | Level 1 | Cash and Cash Equivalents [Member] |  |  |  |
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 (b) |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [2],[3] | 0 | 0 |
Foreign Plan [Member] | Level 1 | Bond funds (c) |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [2],[4] | 0 | 0 |
Foreign Plan [Member] | Level 1 | alternatives fund [Domain] |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [2],[5] | 0 | 0 |
Foreign Plan [Member] | Level 1 | Real Estate Funds [Member] |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [2],[6] | 0 | 0 |
Foreign Plan [Member] | Level 1 | Other assets |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period |  | 6 | 7 |
Foreign Plan [Member] | Level 2 |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period |  | 762 | 842 |
Foreign Plan [Member] | Level 2 | Cash and Cash Equivalents [Member] |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period |  | 12 | 11 |
Foreign Plan [Member] | Level 2 | Equity funds (b) |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [2],[3] | 137 | 204 |
Foreign Plan [Member] | Level 2 | Bond funds (c) |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [2],[4] | 302 | 323 |
Foreign Plan [Member] | Level 2 | alternatives fund [Domain] |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [2],[5] | 209 | 184 |
Foreign Plan [Member] | Level 2 | Real Estate Funds [Member] |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [2],[6] | 81 | 98 |
Foreign Plan [Member] | Level 2 | Other assets |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period |  | 21 | 22 |
Foreign Plan [Member] | Level 3 |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period |  | 64 | 91 |
Foreign Plan [Member] | Level 3 | Cash and Cash Equivalents [Member] |  |  |  |
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 (b) |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [2],[3] | 0 | 0 |
Foreign Plan [Member] | Level 3 | Bond funds (c) |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [2],[4] | 21 | 46 |
Foreign Plan [Member] | Level 3 | alternatives fund [Domain] |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [2],[5] | 0 | 0 |
Foreign Plan [Member] | Level 3 | Real Estate Funds [Member] |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [2],[6] | 28 | 28 |
Foreign Plan [Member] | Level 3 | Other assets |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period |  | $ 15 | $ 17 |
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 |  | 80.00% |  |
[1] | Our United Kingdom pension plan was underfunded as of December 31, 2017 and overfunded as of December 31, 2018. As such, the fair value of plan assets and projected and accumulated benefit obligation related to this plan are no longer captured in this table at December 31, 2018.
[2] | Common/collective trust funds are valued at the net asset value of units held by the plans at year-end.
[3] | Strategy is to invest in diversified funds of global common stocks.
[4] | Strategy is to invest in diversified funds of fixed income securities of varying geographies and credit quality and whose cash flows approximate the maturities of the benefit obligation.
[5] | Strategy is to invest in a fund of diversifying investments, including but not limited to reinsurance, commodities and currencies.
[6] | Strategy is to invest in diversified funds of real estate investment trusts and private real estate.

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