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Leases - Supplemental Cash Flow Information (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Cash Paid for Amounts Included in the Measurement of Lease Liabilities
Operating Cash Flows for Operating Leases	$ 201
Operating Cash Flows for Finance Leases	16
Financing Cash Flows for Finance Leases	5
ROU Assets Obtained in Exchange for Lease Obligations
Operating Leases	124
Finance Leases	$ 34

X

- Definition

Right-of-Use Asset Obtained in Exchange for Lease Obligations [Abstract]

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- Definition

Amount of interest paid on finance lease liability.

+ References

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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.

+ References

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

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

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