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Benefit Plans - Pension plan assets by category and FV (Details) - Pension Plan - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
US
Plan assets
Fair value of plan assets	$ 439	$ 408	$ 353
US | Equity index - U.S.
Plan assets
Fair value of plan assets	45	43
US | Equity index - International
Plan assets
Fair value of plan assets	44	42
US | Fixed income index- Long bond
Plan assets
Fair value of plan assets	$ 276	$ 295
US | Fixed income index- Long bond | Minimum
Plan assets
Fixed income securities maturity (in years)	10 years	10 years
US | Fixed income index - Long government bond
Plan assets
Fair value of plan assets	$ 69	$ 25
US | Fixed income index - Long government bond | Minimum
Plan assets
Fixed income securities maturity (in years)	10 years	10 years
US | Cash
Plan assets
Fair value of plan assets	$ 5	$ 3
US | Fair Value, Inputs, Level 2
Plan assets
Fair value of plan assets	439	408
US | Fair Value, Inputs, Level 2 | Equity index - U.S.
Plan assets
Fair value of plan assets	45	43
US | Fair Value, Inputs, Level 2 | Equity index - International
Plan assets
Fair value of plan assets	44	42
US | Fair Value, Inputs, Level 2 | Fixed income index- Long bond
Plan assets
Fair value of plan assets	276	295
US | Fair Value, Inputs, Level 2 | Fixed income index - Long government bond
Plan assets
Fair value of plan assets	69	25
US | Fair Value, Inputs, Level 2 | Cash
Plan assets
Fair value of plan assets	5	3
Non-US
Plan assets
Fair value of plan assets	249	231	$ 207
Non-US | Equity index - U.S.
Plan assets
Fair value of plan assets	26	22
Non-US | Equity index - International
Plan assets
Fair value of plan assets	19	17
Non-US | Fixed income index- Short bond
Plan assets
Fair value of plan assets	31
Non-US | Fixed income index - Intermediate bond
Plan assets
Fair value of plan assets	38	52
Non-US | Fixed income index- Long bond
Plan assets
Fair value of plan assets	106	95
Non-US | Other
Plan assets
Fair value of plan assets	26	24
Non-US | Cash
Plan assets
Fair value of plan assets	3	21
Non-US | Fair Value, Inputs, Level 1
Plan assets
Fair value of plan assets	3	2
Non-US | Fair Value, Inputs, Level 1 | Cash
Plan assets
Fair value of plan assets	3	2
Non-US | Fair Value, Inputs, Level 2
Plan assets
Fair value of plan assets	246	229
Non-US | Fair Value, Inputs, Level 2 | Equity index - U.S.
Plan assets
Fair value of plan assets	26	22
Non-US | Fair Value, Inputs, Level 2 | Equity index - International
Plan assets
Fair value of plan assets	19	17
Non-US | Fair Value, Inputs, Level 2 | Fixed income index- Short bond
Plan assets
Fair value of plan assets	31
Non-US | Fair Value, Inputs, Level 2 | Fixed income index - Intermediate bond
Plan assets
Fair value of plan assets	38	52
Non-US | Fair Value, Inputs, Level 2 | Fixed income index- Long bond
Plan assets
Fair value of plan assets	106	95
Non-US | Fair Value, Inputs, Level 2 | Other
Plan assets
Fair value of plan assets	$ 26	24
Non-US | Fair Value, Inputs, Level 2 | Cash
Plan assets
Fair value of plan assets		$ 19

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- Definition

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+ References

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