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Basis Of Presentation Recently Adopted Accounting Pronouncements (Details) - USD ($) $ in Millions	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Other current assets	$ 147	$ 139	$ 153
Assets, Current	771	754	768
Operating lease assets, net	544	567	0
Other non-current assets	277	275	276
Assets	7,811	7,842	7,290
Current portion of operating lease liabilities	130	126	0
Accrued expenses and other current liabilities	346	389	401
Liabilities, Current	1,257	1,641	1,527
Long-term operating lease liabilities	473	500	0
Other non-current liabilities	205	197	259
Liabilities	5,622	5,527	4,975
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	2,189	2,315	2,315	$ 2,428	$ 2,622
Liabilities and Equity	$ 7,811	7,842	$ 7,290
Current Assets [Member] | Lease Transition Entries [Domain]
Adjustments due to the adoption of the new leasing standard		(14)
Operating Lease Assets [Member] | Lease Transition Entries [Domain]
Adjustments due to the adoption of the new leasing standard		567
Other non-current assets | Lease Transition Entries [Domain]
Adjustments due to the adoption of the new leasing standard		(1)
Assets, Total [Member] | Lease Transition Entries [Domain]
Adjustments due to the adoption of the new leasing standard		552
Current Operating Lease Liabilities [Member] | Lease Transition Entries [Domain]
Adjustments due to the adoption of the new leasing standard		126
Accrued Liabilities [Member] | Lease Transition Entries [Domain]
Adjustments due to the adoption of the new leasing standard		(12)
Current Liabilities [Member] | Lease Transition Entries [Domain]
Adjustments due to the adoption of the new leasing standard		114
Long-term Operating Lease Liabilities [Member] | Lease Transition Entries [Domain]
Adjustments due to the adoption of the new leasing standard		500
Other Noncurrent Liabilities [Member] | Lease Transition Entries [Domain]
Adjustments due to the adoption of the new leasing standard		(62)
Liabilities, Total [Member] | Lease Transition Entries [Domain]
Adjustments due to the adoption of the new leasing standard		552
Equity [Member] | Lease Transition Entries [Domain]
Adjustments due to the adoption of the new leasing standard		0
Liabilities and Equity, Total [Member] | Lease Transition Entries [Domain]
Adjustments due to the adoption of the new leasing standard		$ 552
Maximum | Short-term lease [Member]
Lessee, Operating Lease, Term of Contract	12 months

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