Leases Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease right-of-use assets	$ 611	$ 0
Accrued expenses and other current liabilities	119
Long-term lease liabilities included within Operating lease liabilities	532	$ 0
Total operating lease liabilities	$ 651
Weighted average remaining lease term	8 years 9 months 18 days
Weighted average discount rate	3.50%