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Benefit Plans - Pension plan assets by category and FV (Details) - Pension Plan - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
US
Plan assets
Fair value of plan assets	$ 353	$ 404	$ 368
Expected contribution in next fiscal year	1
US | Equity index - U.S.
Plan assets
Fair value of plan assets	33	51
US | Equity index - International
Plan assets
Fair value of plan assets	35	55
US | Fixed income index- Long bond
Plan assets
Fair value of plan assets	$ 258	273
Fixed income securities maturity (in years)	10 years
US | Fixed income index - Long government bond
Plan assets
Fair value of plan assets	$ 24	21
Fixed income securities maturity (in years)	10 years
US | Cash
Plan assets
Fair value of plan assets	$ 3	4
US | Fair Value, Inputs, Level 2
Plan assets
Fair value of plan assets	353	404
US | Fair Value, Inputs, Level 2 | Equity index - U.S.
Plan assets
Fair value of plan assets	33	51
US | Fair Value, Inputs, Level 2 | Equity index - International
Plan assets
Fair value of plan assets	35	55
US | Fair Value, Inputs, Level 2 | Fixed income index- Long bond
Plan assets
Fair value of plan assets	258	273
US | Fair Value, Inputs, Level 2 | Fixed income index - Long government bond
Plan assets
Fair value of plan assets	24	21
US | Fair Value, Inputs, Level 2 | Cash
Plan assets
Fair value of plan assets	3	4
Non-US
Plan assets
Fair value of plan assets	207	235	$ 211
Expected contribution in next fiscal year	3
Non-US | Equity index - U.S.
Plan assets
Fair value of plan assets	3	12
Non-US | Equity index - Canada
Plan assets
Fair value of plan assets	13	22
Non-US | Equity index - International
Plan assets
Fair value of plan assets	15	52
Non-US | Equity index - Real estate
Plan assets
Fair value of plan assets	2	5
Non-US | Fixed income index - Intermediate bond
Plan assets
Fair value of plan assets	34	25
Non-US | Fixed income index- Long bond
Plan assets
Fair value of plan assets	99	84
Non-US | Other
Plan assets
Fair value of plan assets	24	24
Non-US | Cash
Plan assets
Fair value of plan assets	17	11
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	205	233
Non-US | Fair Value, Inputs, Level 2 | Equity index - U.S.
Plan assets
Fair value of plan assets	3	12
Non-US | Fair Value, Inputs, Level 2 | Equity index - Canada
Plan assets
Fair value of plan assets	13	22
Non-US | Fair Value, Inputs, Level 2 | Equity index - International
Plan assets
Fair value of plan assets	15	52
Non-US | Fair Value, Inputs, Level 2 | Equity index - Real estate
Plan assets
Fair value of plan assets	2	5
Non-US | Fair Value, Inputs, Level 2 | Fixed income index - Intermediate bond
Plan assets
Fair value of plan assets	34	25
Non-US | Fair Value, Inputs, Level 2 | Fixed income index- Long bond
Plan assets
Fair value of plan assets	99	84
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	$ 15	$ 9

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+ References

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