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Debt Obligations (Changes in Debt Obligations) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Mar. 31, 2016	Nov. 30, 2014
Changes in Debt Obligations [Roll Forward]
Debt obligations at beginning of period	$ 2,364,000,000
Additions	2,456,000,000
Payments, Accretion and Other	(1,217,000,000)
Debt obligations at end of period	3,603,000,000
$400 million senior unsecured term loan facility due November 25, 2019
Changes in Debt Obligations [Roll Forward]
Debt obligations at beginning of period	0
Additions	399,000,000
Payments, Accretion and Other	0
Debt obligations at end of period	399,000,000
Credit facility, borrowing capacity	$ 400,000,000	$ 400,000,000
Interest rate during period	2.00%
Senior Notes | 5.55% senior unsecured notes due January 15, 2020
Changes in Debt Obligations [Roll Forward]
Debt obligations at beginning of period	$ 597,000,000
Additions	0
Payments, Accretion and Other	1,000,000
Debt obligations at end of period	$ 598,000,000
Stated rate	5.55%
Senior Notes | 5.25% senior unsecured notes due January 16, 2018
Changes in Debt Obligations [Roll Forward]
Debt obligations at beginning of period	$ 368,000,000
Additions	0
Payments, Accretion and Other	1,000,000
Debt obligations at end of period	$ 369,000,000
Stated rate	5.25%
Senior Notes | 3.875% senior unsecured notes due June 7, 2021
Changes in Debt Obligations [Roll Forward]
Debt obligations at beginning of period	$ 646,000,000
Additions	0
Payments, Accretion and Other	(21,000,000)
Debt obligations at end of period	$ 625,000,000
Stated rate	3.875%
Senior Notes | 4.25% senior unsecured notes due June 1, 2024
Changes in Debt Obligations [Roll Forward]
Debt obligations at beginning of period	$ 495,000,000
Additions	0
Payments, Accretion and Other	0
Debt obligations at end of period	$ 495,000,000
Stated rate	4.25%
Senior Notes | 1.75% senior unsecured notes due May 19, 2023
Changes in Debt Obligations [Roll Forward]
Debt obligations at beginning of period	$ 0
Additions	664,000,000
Payments, Accretion and Other	(42,000,000)
Debt obligations at end of period	$ 622,000,000
Stated rate	1.75%
Senior Notes | 3.85% senior unsecured notes due June 30, 2026
Changes in Debt Obligations [Roll Forward]
Debt obligations at beginning of period	$ 0
Additions	495,000,000
Payments, Accretion and Other	0
Debt obligations at end of period	$ 495,000,000
Stated rate	3.85%
Revolving Credit Facility | $750 million revolving credit commitment due November 25, 2019
Changes in Debt Obligations [Roll Forward]
Debt obligations at beginning of period	$ 258,000,000
Additions	898,000,000
Payments, Accretion and Other	(1,156,000,000)
Debt obligations at end of period	0
Credit facility, borrowing capacity	$ 750,000,000		$ 750,000,000
Interest rate during period	1.63%

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Changes in Debt Obligations [Roll Forward]

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No definition available.

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Payments (Accretions) And Other of Long-term Debt

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- Definition

The average effective interest rate during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Contractual interest rate for funds borrowed, under the debt agreement.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Name Accounting Standards Codification
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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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