Pension Benefits Fair Value of Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	$ 438	$ 438
Cash
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	13	45
Time Deposits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	29	28
Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	33	33
Bond Mutual Funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	216	186
Real Estate Trust Funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	35	34
Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	11	9
Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	4	7
Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	56	55
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	41	41
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	110	141
Level 1 | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	13	45
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	56	55
Level 1 | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	41	41
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	278	247
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	29	28
Level 2 | Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	33	33
Level 2 | Bond Mutual Funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	216	186
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	50	50
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	35	34	$ 31
Level 3 | Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	11	9	15
Level 3 | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	4	7	$ 7
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