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Benefit Plans - Pension plan assets by category and FV (Details) - Pension Plan - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
US
Plan assets
Fair value of plan assets	$ 408	$ 353	$ 404
Expected contribution in next fiscal year	1
US | Equity index - U.S.
Plan assets
Fair value of plan assets	43	33
US | Equity index - International
Plan assets
Fair value of plan assets	42	35
US | Fixed income index- Long bond
Plan assets
Fair value of plan assets	$ 295	258
Fixed income securities maturity (in years)	10 years
US | Fixed income index - Long government bond
Plan assets
Fair value of plan assets	$ 25	24
Fixed income securities maturity (in years)	10 years
US | Cash
Plan assets
Fair value of plan assets	$ 3	3
US | Fair Value, Inputs, Level 2
Plan assets
Fair value of plan assets	408	353
US | Fair Value, Inputs, Level 2 | Equity index - U.S.
Plan assets
Fair value of plan assets	43	33
US | Fair Value, Inputs, Level 2 | Equity index - International
Plan assets
Fair value of plan assets	42	35
US | Fair Value, Inputs, Level 2 | Fixed income index- Long bond
Plan assets
Fair value of plan assets	295	258
US | Fair Value, Inputs, Level 2 | Fixed income index - Long government bond
Plan assets
Fair value of plan assets	25	24
US | Fair Value, Inputs, Level 2 | Cash
Plan assets
Fair value of plan assets	3	3
Non-US
Plan assets
Fair value of plan assets	231	207	$ 235
Expected contribution in next fiscal year	3
Non-US | Equity index - U.S.
Plan assets
Fair value of plan assets	22	3
Non-US | Equity index - Canada
Plan assets
Fair value of plan assets		13
Non-US | Equity index - International
Plan assets
Fair value of plan assets	17	15
Non-US | Equity index - Real estate
Plan assets
Fair value of plan assets		2
Non-US | Fixed income index - Intermediate bond
Plan assets
Fair value of plan assets	52	34
Non-US | Fixed income index- Long bond
Plan assets
Fair value of plan assets	95	99
Non-US | Other
Plan assets
Fair value of plan assets	24	24
Non-US | Cash
Plan assets
Fair value of plan assets	21	17
Non-US | Fair Value, Inputs, Level 1
Plan assets
Fair value of plan assets	2	2
Non-US | Fair Value, Inputs, Level 1 | Cash
Plan assets
Fair value of plan assets	2	2
Non-US | Fair Value, Inputs, Level 2
Plan assets
Fair value of plan assets	229	205
Non-US | Fair Value, Inputs, Level 2 | Equity index - U.S.
Plan assets
Fair value of plan assets	22	3
Non-US | Fair Value, Inputs, Level 2 | Equity index - Canada
Plan assets
Fair value of plan assets		13
Non-US | Fair Value, Inputs, Level 2 | Equity index - International
Plan assets
Fair value of plan assets	17	15
Non-US | Fair Value, Inputs, Level 2 | Equity index - Real estate
Plan assets
Fair value of plan assets		2
Non-US | Fair Value, Inputs, Level 2 | Fixed income index - Intermediate bond
Plan assets
Fair value of plan assets	52	34
Non-US | Fair Value, Inputs, Level 2 | Fixed income index- Long bond
Plan assets
Fair value of plan assets	95	99
Non-US | Fair Value, Inputs, Level 2 | Other
Plan assets
Fair value of plan assets	24	24
Non-US | Fair Value, Inputs, Level 2 | Cash
Plan assets
Fair value of plan assets	$ 19	$ 15

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