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Pension and Other Benefit Programs - Fair Value Of Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value Measurements | $ 946 | $ 819
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value Measurements | 144 | 135
Significant Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value Measurements | 796 | 677
Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value Measurements | 6 | 7
Cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value Measurements | 7 | 8
Cash | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value Measurements | 7 | 8
Cash | Significant Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value Measurements | 0 | 0
Cash | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value Measurements | 0 | 0
U.S. large-cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value Measurements | 25 | 21
U.S. large-cap | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value Measurements | 0 | 0
U.S. large-cap | Significant Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value Measurements | 25 | 21
U.S. large-cap | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value Measurements | 0 | 0
U.S. small-cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value Measurements | 7 | 5
U.S. small-cap | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value Measurements | 0 | 0
U.S. small-cap | Significant Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value Measurements | 7 | 5
U.S. small-cap | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value Measurements | 0 | 0
International |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value Measurements | 13 | 11
International | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value Measurements | 0 | 0
International | Significant Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value Measurements | 13 | 11
International | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value Measurements | 0 | 0
Fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value Measurements | 894 | 774
Fixed income securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value Measurements | 137 | 127
Fixed income securities | Significant Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value Measurements | 751 | 640
Fixed income securities | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value Measurements | $ 6 | $ 7

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