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Pension Benefits Fair Value of Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	$ 362	$ 377
Cash
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	22	17
Time Deposits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	23	4
Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	25	114
Bond Mutual Funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	148	94
Real Estate Trust Funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	24	13
Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	21	27
Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	6	6
Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	53	51
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	40	51
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	115	119
Level 1 | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	22	17
Level 1 | Time Deposits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Level 1 | Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Level 1 | Bond Mutual Funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Level 1 | Real Estate Trust Funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Level 1 | Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Level 1 | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Level 1 | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	53	51
Level 1 | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	40	51
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	196	212
Level 2 | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Level 2 | Time Deposits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	23	4
Level 2 | Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	25	114
Level 2 | Bond Mutual Funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	148	94
Level 2 | Real Estate Trust Funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Level 2 | Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Level 2 | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Level 2 | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Level 2 | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	51	46
Level 3 | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Level 3 | Time Deposits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Level 3 | Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Level 3 | Bond Mutual Funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Level 3 | Real Estate Trust Funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	24	13	$ 29
Level 3 | Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	21	27	107
Level 3 | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	6	6	$ 5
Level 3 | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Level 3 | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	$ 0	$ 0

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