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Employee Benefit Plans - Fair Value of Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation |  | $ 2,222 | $ 2,016 |
Defined Benefit Plan, Benefit Obligation |  | (693) | (633) |
Defined Benefit Plan, Plan Assets, Amount |  | 2,435 | 2,222 | $ 2,530
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation |  | 2,217 | 2,012 |
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets |  | 1,380 | 1,271 |
U.S. Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Benefit Obligation |  | (577) | (494) |
Defined Benefit Plan, Plan Assets, Amount |  | 1,377 | 1,269 | 1,444
U.S. Pension Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 43 | 39 |
U.S. Pension Benefits | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 1,143 | 1,010 |
U.S. Pension Benefits | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 | 0 |
U.S. Pension Benefits | Equity Securities, Common Stock [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [1] | 0 | 0 |
U.S. Pension Benefits | Equity Securities, Common Stock [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [1] | 0 | 0 |
U.S. Pension Benefits | Equity Securities, Common Stock [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [1] | 0 | 0 |
U.S. Pension Benefits | Equity Securities, Common Stock [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [1] | 0 | 0 |
U.S. Pension Benefits | Government Debt Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [2] | 209 | 247 |
U.S. Pension Benefits | Government Debt Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [2] | 0 | 0 |
U.S. Pension Benefits | Government Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [2] | 209 | 247 |
U.S. Pension Benefits | Government Debt Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [2] | 0 | 0 |
U.S. Pension Benefits | Corporate Debt Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [3] | 934 | 761 |
U.S. Pension Benefits | Corporate Debt Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [3] | 0 | 0 |
U.S. Pension Benefits | Corporate Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [3] | 934 | 761 |
U.S. Pension Benefits | Corporate Debt Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [3] | 0 | 0 |
U.S. Pension Benefits | Money Market Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 12 | 13 |
U.S. Pension Benefits | Money Market Funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
U.S. Pension Benefits | Money Market Funds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 2 |
U.S. Pension Benefits | Money Market Funds [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
U.S. Pension Benefits | Common and Commingled Trusts, Equities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
U.S. Pension Benefits | Common and Commingled Trusts, Equities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
U.S. Pension Benefits | Common and Commingled Trusts, Equities [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
U.S. Pension Benefits | Common and Commingled Trusts, Equities [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
U.S. Pension Benefits | Common and Commingled Trusts, Bonds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 157 | 174 |
U.S. Pension Benefits | Common and Commingled Trusts, Bonds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
U.S. Pension Benefits | Common and Commingled Trusts, Bonds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
U.S. Pension Benefits | Common and Commingled Trusts, Bonds [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
U.S. Pension Benefits | Common and Commingled Trusts, Short Term Investments [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 19 | 27 |
U.S. Pension Benefits | Common and Commingled Trusts, Short Term Investments [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
U.S. Pension Benefits | Common and Commingled Trusts, Short Term Investments [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
U.S. Pension Benefits | Common and Commingled Trusts, Short Term Investments [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
U.S. Pension Benefits | Common and Commingled Trusts, Balanced [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
U.S. Pension Benefits | Common and Commingled Trusts, Balanced [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
U.S. Pension Benefits | Common and Commingled Trusts, Balanced [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
U.S. Pension Benefits | Common and Commingled Trusts, Balanced [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
U.S. Pension Benefits | Partnership And Joint Venture Interests, Real Estate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [5] | 1 | 4 |
U.S. Pension Benefits | Partnership And Joint Venture Interests, Real Estate [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [5] | 0 | 0 |
U.S. Pension Benefits | Partnership And Joint Venture Interests, Real Estate [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [5] | 0 | 0 |
U.S. Pension Benefits | Partnership And Joint Venture Interests, Real Estate [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [5] | 0 | 0 |
U.S. Pension Benefits | Partnership And Joint Venture Interests, Other [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [5] | 2 | 4 |
U.S. Pension Benefits | Partnership And Joint Venture Interests, Other [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [5] | 0 | 0 |
U.S. Pension Benefits | Partnership And Joint Venture Interests, Other [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [5] | 0 | 0 |
U.S. Pension Benefits | Partnership And Joint Venture Interests, Other [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [5] | 0 | 0 |
U.S. Pension Benefits | Mutual Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 43 | 39 |
U.S. Pension Benefits | Mutual Funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 43 | 39 |
U.S. Pension Benefits | Mutual Funds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
U.S. Pension Benefits | Mutual Funds [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
U.S. Pension Benefits | Insurance Products [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
U.S. Pension Benefits | Insurance Products [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
U.S. Pension Benefits | Insurance Products [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
U.S. Pension Benefits | Insurance Products [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
U.S. Pension Benefits | Real Estate And Other [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [5] | 0 | 0 |
U.S. Pension Benefits | Real Estate And Other [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [5] | 0 | 0 |
U.S. Pension Benefits | Real Estate And Other [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [5] | 0 | 0 |
U.S. Pension Benefits | Real Estate And Other [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [5] | 0 | 0 |
U.S. Pension Benefits | Not Subject to Leveling [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 191 | 220 |
U.S. Pension Benefits | Not Subject to Leveling [Member] | Equity Securities, Common Stock [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [1] | 0 | 0 |
U.S. Pension Benefits | Not Subject to Leveling [Member] | Government Debt Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [2] | 0 | 0 |
U.S. Pension Benefits | Not Subject to Leveling [Member] | Corporate Debt Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [3] | 0 | 0 |
U.S. Pension Benefits | Not Subject to Leveling [Member] | Money Market Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 12 | 11 |
U.S. Pension Benefits | Not Subject to Leveling [Member] | Common and Commingled Trusts, Equities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
U.S. Pension Benefits | Not Subject to Leveling [Member] | Common and Commingled Trusts, Bonds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 157 | 174 |
U.S. Pension Benefits | Not Subject to Leveling [Member] | Common and Commingled Trusts, Short Term Investments [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 19 | 27 |
U.S. Pension Benefits | Not Subject to Leveling [Member] | Common and Commingled Trusts, Balanced [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
U.S. Pension Benefits | Not Subject to Leveling [Member] | Partnership And Joint Venture Interests, Real Estate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [5] | 1 | 4 |
U.S. Pension Benefits | Not Subject to Leveling [Member] | Partnership And Joint Venture Interests, Other [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [5] | 2 | 4 |
U.S. Pension Benefits | Not Subject to Leveling [Member] | Mutual Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
U.S. Pension Benefits | Not Subject to Leveling [Member] | Insurance Products [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
U.S. Pension Benefits | Not Subject to Leveling [Member] | Real Estate And Other [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [5] | 0 | 0 |
Foreign Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Benefit Obligation |  | (116) | (139) |
Defined Benefit Plan, Plan Assets, Amount |  | 1,058 | 953 | 1,086
Foreign Plan [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 53 | 44 |
Foreign Plan [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 104 | 109 |
Foreign Plan [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 131 | 129 | $ 131
Foreign Plan [Member] | Equity Securities, Common Stock [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [1] | 53 | 44 |
Foreign Plan [Member] | Equity Securities, Common Stock [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [1] | 53 | 44 |
Foreign Plan [Member] | Equity Securities, Common Stock [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [1] | 0 | 0 |
Foreign Plan [Member] | Equity Securities, Common Stock [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [1] | 0 | 0 |
Foreign Plan [Member] | Government Debt Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [2] | 0 | 0 |
Foreign Plan [Member] | Government Debt Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [2] | 0 | 0 |
Foreign Plan [Member] | Government Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [2] | 0 | 0 |
Foreign Plan [Member] | Government Debt Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [2] | 0 | 0 |
Foreign Plan [Member] | Corporate Debt Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [3] | 103 | 100 |
Foreign Plan [Member] | Corporate Debt Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [3] | 0 | 0 |
Foreign Plan [Member] | Corporate Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [3] | 103 | 100 |
Foreign Plan [Member] | Corporate Debt Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [3] | 0 | 0 |
Foreign Plan [Member] | Money Market Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 10 | 8 |
Foreign Plan [Member] | Money Market Funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
Foreign Plan [Member] | Money Market Funds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 8 |
Foreign Plan [Member] | Money Market Funds [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
Foreign Plan [Member] | Common and Commingled Trusts, Equities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 184 | 150 |
Foreign Plan [Member] | Common and Commingled Trusts, Equities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
Foreign Plan [Member] | Common and Commingled Trusts, Equities [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
Foreign Plan [Member] | Common and Commingled Trusts, Equities [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
Foreign Plan [Member] | Common and Commingled Trusts, Bonds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 470 | 405 |
Foreign Plan [Member] | Common and Commingled Trusts, Bonds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
Foreign Plan [Member] | Common and Commingled Trusts, Bonds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
Foreign Plan [Member] | Common and Commingled Trusts, Bonds [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
Foreign Plan [Member] | Common and Commingled Trusts, Short Term Investments [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 21 | 40 |
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
Foreign Plan [Member] | Common and Commingled Trusts, Balanced [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 85 | 76 |
Foreign Plan [Member] | Common and Commingled Trusts, Balanced [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
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Foreign Plan [Member] | Partnership And Joint Venture Interests, Real Estate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
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Foreign Plan [Member] | Partnership And Joint Venture Interests, Other [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [5] | 0 | 0 |
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
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Foreign Plan [Member] | Mutual Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 85 | 76 |
Foreign Plan [Member] | Not Subject to Leveling [Member] | Partnership And Joint Venture Interests, Real Estate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [5] | 0 | 0 |
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] | 0 | 0 |
Foreign Plan [Member] | Not Subject to Leveling [Member] | Real Estate And Other [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
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[1] | Common stocks are valued based on quoted market prices at the closing price as reported on the active market on which the individual securities are traded.
[2] | Government securities are valued based on yields currently available on comparable securities of issuers with similar credit ratings. When quoted prices are not available for identical or similar securities, the security is valued under a discounted cash flows approach that maximizes observable inputs, such as current yields on similar instruments but includes adjustments for certain risks that may not be observable, such as credit and liquidity risks.
[3] | Corporate debt is valued primarily based on observable market quotations for similar bonds at the closing price reported on the active market on which the individual securities are traded. When such quoted prices are not available, the bonds are valued using a discounted cash flows approach using current yields on similar instruments of issuers with similar credit ratings.
[4] | Common/collective trusts and registered investment companies (RICs) such as mutual funds are valued using a Net Asset Value (NAV) provided by the manager of each fund. The NAV is based on the underlying net assets owned by the fund, divided by the number of shares or units outstanding. The fair value of the underlying securities within the fund, which are generally traded on an active market, are valued at the closing price reported on the active market on which those individual securities are traded. For investments not traded on an active market, or for which a quoted price is not publicly available, a variety of unobservable valuation methodologies, including discounted cash flow, market multiple and cost valuation approaches, are employed by the fund manager or independent third party to value investments.
[5] | Partnership/joint ventures are valued based on the fair value of the underlying securities within the fund, which include investments both traded on an active market and not traded on an active market. For those investments that are traded on an active market, the values are based on the closing price reported on the active market on which those individual securities are traded. For investments not traded on an active market, or for which a quoted price is not publicly available, a variety of unobservable valuation methodologies, including discounted cash flow, market multiples and cost valuation approaches, are employed by the fund manager to value investments.

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