Pension Benefits Fair Value of Plan Assets, Unobservable Input Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
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	$ 438
Fair Value of Plan Assets at end of year	438	$ 438
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	50
Fair Value of Plan Assets at end of year	50	50
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	34
Fair Value of Plan Assets at end of year	35	34
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	3	1
Purchases, Sales, and Settlements	(1)	0
Foreign currency translation and other	(1)	2
Fair Value of Plan Assets at beginning of year	34	31
Fair Value of Plan Assets at end of year	35	34
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	9
Fair Value of Plan Assets at end of year	11	9
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	2	(1)
Purchases, Sales, and Settlements	0	(6)
Foreign currency translation and other	0	1
Fair Value of Plan Assets at beginning of year	9	15
Fair Value of Plan Assets at end of year	11	9
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	7
Fair Value of Plan Assets at end of year	4	7
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	0
Purchases, Sales, and Settlements	(3)	0
Foreign currency translation and other	0	0
Fair Value of Plan Assets at beginning of year	7	7
Fair Value of Plan Assets at end of year	$ 4	$ 7