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 from financing leases	$ 10
Operating cash flows from operating leases	192
Financing cash flows from financing leases	120
Right-of-use assets obtained in exchange for lease obligations:
Operating lease liabilities	804
Finance lease liabilities	$ 196

Cash Paid For Amounts Included In The Measurement Of Lease Liabilities [Abstract]

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Right-Of-Use Assets 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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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
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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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-Publisher FASB
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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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