Leases - Future Maturities of Lease Liabilities - ASC 840 (Details) $ in Millions	Dec. 31, 2018 USD ($)
Capital Leases
Minimum lease payments, 2019	$ 8
Minimum lease payments, 2020	7
Minimum lease payments, 2021	18
Minimum lease payments, 2022	3
Minimum lease payments, 2023	2
Minimum lease payments, 2024 and Beyond	23
Minimum lease payments	61
Imputed interest, 2019	(3)
Imputed interest, 2020	(3)
Imputed interest, 2021	(3)
Imputed interest, 2022	(1)
Imputed interest, 2023	(1)
Imputed interest, 2024 and Beyond	(13)
Imputed interest	(24)
Present value, 2019	5
Present value, 2020	4
Present value, 2021	15
Present value, 2022	2
Present value, 2023	1
Present value, 2024 and Beyond	10
Present value	37
Operating Leases
Minimum lease payments, 2019	266
Minimum lease payments, 2020	214
Minimum lease payments, 2021	161
Minimum lease payments, 2022	110
Minimum lease payments, 2023	84
Minimum lease payments, 2024 and Beyond	391
Total Lease Payments	1,226
Minimum sublease rentals, 2019	(15)
Minimum sublease rentals, 2020	(12)
Minimum sublease rentals, 2021	(8)
Minimum sublease rentals, 2022	(5)
Minimum sublease rentals, 2023	(3)
Minimum sublease rentals, 2024 and Beyond	(6)
Minimum sublease rentals	(49)
Net future minimum payments due, 2019	251
Net future minimum payments due, 2020	202
Net future minimum payments due, 2021	153
Net future minimum payments due, 2022	105
Net future minimum payments due, 2023	81
Net future minimum payments due, 2024 and Beyond	385
Net future minimum payments due	1,177
Imputed interest	(263)
Present value	$ 914

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Amount of minimum lease payments for capital leases.

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Amount of minimum lease payments for capital leases due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount necessary to reduce net minimum lease payments to present value for capital leases.

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Present value of minimum lease payments for capital leases net of executory costs, including amounts paid by the lessee to the lessor for insurance, maintenance and taxes.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Future minimum rental payments in aggregate as of the balance sheet date under operating leases.

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Future rental payments receivable within one year of the balance sheet date under an operating lease.

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Future rental payments receivable within the fifth year from the balance sheet date under an operating lease.

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Future rental payments receivable within the fourth year from the balance sheet date under an operating lease.

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Future rental payments receivable within the third year from the balance sheet date under an operating lease.

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Future rental payments receivable within the second year from the balance sheet date under an operating lease.

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Future minimum lease payments receivable under operating leases for periods greater than five years following the balance sheet date.

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