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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Life insurance contracts and other private equity investments, which approximates fair value	$ 539	$ 515

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- Definition

Life insurance contracts and cost method investments fair value disclosure

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No definition available.

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- References

No definition available.

+ Details

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