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Pension Benefits Fair Value of Plan Assets, Unobservable Input Reconciliation (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement [Abstract] |  |
Fair Value of Plan Assets at beginning of year | $ 377 |
Fair Value of Plan Assets at end of year | 362 | $ 377
Level 3 |  |
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement [Abstract] |  |
Fair Value of Plan Assets at beginning of year | 46 |
Fair Value of Plan Assets at end of year | 51 | 46
Real Estate Trust Funds |  |
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement [Abstract] |  |
Fair Value of Plan Assets at beginning of year | 13 |
Fair Value of Plan Assets at end of year | 24 | 13
Real Estate Trust Funds | Level 3 |  |
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement [Abstract] |  |
Actual Return on Plan Assets Still Held at the Reporting Date | 2 | 1
Purchases, Sales, and Settlements | 9 | 6
Spin-Off of Delphi Technologies |  | (23)
Foreign currency translation and other | 0 | 0
Fair Value of Plan Assets at beginning of year | 13 | 29
Fair Value of Plan Assets at end of year | 24 | 13
Hedge Funds |  |
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement [Abstract] |  |
Fair Value of Plan Assets at beginning of year | 27 |
Fair Value of Plan Assets at end of year | 21 | 27
Hedge Funds | Level 3 |  |
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement [Abstract] |  |
Actual Return on Plan Assets Still Held at the Reporting Date | 0 | 2
Purchases, Sales, and Settlements | (4) | 0
Spin-Off of Delphi Technologies |  | (84)
Foreign currency translation and other | (2) | 2
Fair Value of Plan Assets at beginning of year | 27 | 107
Fair Value of Plan Assets at end of year | 21 | 27
Insurance Contracts |  |
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement [Abstract] |  |
Fair Value of Plan Assets at beginning of year | 6 |
Fair Value of Plan Assets at end of year | 6 | 6
Insurance Contracts | Level 3 |  |
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement [Abstract] |  |
Actual Return on Plan Assets Still Held at the Reporting Date | 0 | 1
Purchases, Sales, and Settlements | 0 | 0
Spin-Off of Delphi Technologies |  | 0
Foreign currency translation and other | 0 | 0
Fair Value of Plan Assets at beginning of year | 6 | 5
Fair Value of Plan Assets at end of year | $ 6 | $ 6

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