Recently Issued Accounting Pronouncements - Schedule of Impact of Adoption on Condensed Consolidated Financial Statements (Details) - USD ($) $ in Millions	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Assets
Other current assets	$ 518	$ 531	$ 539
Other assets	751	734	482
Liabilities
Accrued expenses and other liabilities	1,198	950	896
Other liabilities	$ 1,363	1,357	$ 1,167
Adjustments due to adoption of new lease accounting standard
Assets
Other current assets		(8)
Other assets		252
Liabilities
Accrued expenses and other liabilities		54
Other liabilities		$ 190