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Leases - Other Information (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Leases [Abstract]
Operating cash flows for operating leases	$ 67
Financing cash flows for finance leases	7
Right-of-use assets obtained in exchange for new lease liabilities, operating leases	$ 10
Weighted-average remaining lease term (in years)
Operating leases, weighted-average lease term	10 years
Finance leases, weighted-average lease term	3 years 4 months 24 days
Weighted-average discount rate
Operating leases, weighted-average discount rate	4.50%
Finance leases, weighted-average discount rate	2.20%

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Lease, Weighted Average Remaining Lease Term [Abstract]

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Amount of cash outflow for principal payment on finance lease.

+ References

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Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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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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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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