Leases (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Other assets	$ 710	$ 710
Accrued liabilities - Other	184	184
Income taxes and other liabilities	524	524
Total lease liabilities	708	708
Operating lease cost	59	119
Short-term lease cost	18	30
Variable lease cost	2	10
Total lease cost	79	159
2019	117	117
2020	177	177
2021	132	132
2022	94	94
2023	69	69
Thereafter	319	319
Total lease payments	908	908
Less: Interest	200	200
Present value of lease liabilities	$ 708	708
2019			$ 147
2020			103
2021			73
2022			52
2023			43
Thereafter			354
Minimum rental commitments			$ 772
Cash paid for amounts included in the measurement of lease liabilities in Operating cash flows		121
Leased assets obtained in exchange for new operating lease liabilities		$ 98
Weighted-average remaining lease term (years)	10 years 3 months 18 days	10 years 3 months 18 days
Weighted-average discount rate	4.70%	4.70%
Cost of Sales [Member]
Lessee, Lease, Description [Line Items]
Total lease cost	$ 19	$ 38
Marketing Administration And Research Costs [Member]
Lessee, Lease, Description [Line Items]
Total lease cost	$ 60	$ 121
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lease term	1 year	1 year
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lease term	75 years	75 years