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Fair Value Measurements - Defined Benefit Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount | $ 110 | $ 0
United States | Fair Value, Recurring [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount | 176 | 216
United States | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount | 23 | 30
United States | Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount | 153 | 186
United States | Fixed Income Securities [Member] | Fair Value, Recurring [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount | 88 | 122
United States | Fixed Income Securities [Member] | Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount | 88 | 121
United States | Equity securities | Fair Value, Recurring [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount | 59 | 71
United States | Equity securities | Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount | 51 | 60
United States | Real estate and other | Fair Value, Recurring [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount | 29 | 23
United States | Real estate and other | Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount | 14 | 5
United States | Valuation, Market Approach [Member] | Fixed Income Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount |  | 1
United States | Valuation, Market Approach [Member] | Equity securities | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount | 8 | 11
United States | Valuation, Market Approach [Member] | Real estate and other | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount | 15 | 18
Non-US [Member] | Fair Value, Recurring [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount | 505 | 438
Non-US [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount | 111 | 93
Non-US [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount | 110 |
Non-US [Member] | Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount | 284 | 345
Non-US [Member] | Fixed Income Securities [Member] | Fair Value, Recurring [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount | 168 | 239
Non-US [Member] | Fixed Income Securities [Member] | Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount | 168 | 239
Non-US [Member] | Equity securities | Fair Value, Recurring [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount | 185 | 163
Non-US [Member] | Equity securities | Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount | 74 | 70
Non-US [Member] | Other | Fair Value, Recurring [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount |  | 36
Non-US [Member] | Other | Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount |  | 36
Non-US [Member] | Insurance contract, real estate and other [Member] | Fair Value, Recurring [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount | 152 |
Non-US [Member] | Insurance contract, real estate and other [Member] | Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount | 42 |
Non-US [Member] | Valuation, Market Approach [Member] | Fixed Income Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0
Non-US [Member] | Valuation, Market Approach [Member] | Equity securities | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount | 111 | $ 93
Non-US [Member] | Valuation, Market Approach [Member] | Insurance contract, real estate and other [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Amount | $ 110 |

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