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Leases - Supplemental Cash Flow Information (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$ 53
Operating cash flows from finance leases	0
Financing cash flows from finance leases	11
Right-of-use assets obtained in exchange for lease liabilities
Operating leases	56
Finance leases	$ 15

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Cash Flow, Lessee [Abstract]

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- Definition

Right-Of-Use Asset Obtained In Exchange For Lease Liability [Abstract]

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X

- Definition

Amount of interest paid on finance lease liability.

+ References

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-Publisher FASB
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-SubTopic 20
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-Paragraph 4
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- Definition

Amount of cash outflow for principal payment on finance lease.

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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