Lease Commitments - Estimated Future Minimum Lease Payments (Details) $ in Millions	Dec. 31, 2018 USD ($)
Operating Leases
Operating Leases, 2019	$ 540
Operating Leases, 2020	492
Operating Leases, 2021	378
Operating Leases, 2022	242
Operating Leases, 2023	166
Operating Leases, Thereafter	341
Operating Leases, Total	2,159
Capital Leases
Capital Leases, 2019	30
Capital Leases, 2020	22
Capital Leases, 2021	17
Capital Leases, 2022	16
Capital Leases, 2023	16
Capital Leases, Thereafter	132
Capital Leases, Total	233
Less: Amounts representing interest and executory costs	(88)
Net present values	145
Less: Capital lease obligations included in short-term debt	(18)
Long-term capital lease obligations	127
Lessee, Capital Lease, Lease Not yet Commenced, Future Payments [Abstract]
2019	14
2020	15
2021	22
2022	21
2023	21
Thereafter	$ 219

Less: Amounts representing interest and executory costs in future capital lease payments.

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date.

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