Leased Assets (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Leases [Abstract]
Gross rental expense	$ 333	$ 332	$ 332
Sublease rental income	(16)	(17)	(27)
Rent expense, net	317	$ 315	$ 305
Future Minimum Payments Due, Fiscal Year Maturity
2019	8
2020	7
2021	18
2022	3
2023	2
2024 and Beyond	23
Total	61
Imputed Interest, Fiscal Year Maturity
2019	(3)
2020	(3)
2021	(3)
2022	(1)
2023	(1)
2024 and Beyond	(13)
Total	(24)
Present Value, Fiscal Year Maturity
2019	5
2020	4
2021	15
2022	2
2023	1
2024 and Beyond	10
Total	37
Future Minimum Payments Due, Fiscal Year Maturity
2019	266
2020	214
2021	161
2022	110
2023	84
2024 and Beyond	391
Total	1,226
Minimum Sublease Rentals, Fiscal Year Maturity
2019	(15)
2020	(12)
2021	(8)
2022	(5)
2023	(3)
2024 and Beyond	(6)
Total	(49)
Future Minimum Payments Due, Net of Sublease Rentals, Fiscal Year Maturity
2019	251
2020	202
2021	153
2022	105
2023	81
2024 and Beyond	385
Total	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 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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Future minimum lease payments receivable under operating leases for periods greater than five years following the balance sheet date.

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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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