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Long-Term Debt (Details) - USD ($)						12 Months Ended
Long-Term Debt (Details) - USD ($)	Jan. 21, 2016	Jan. 06, 2016	Nov. 07, 2014	Nov. 08, 2013	Oct. 03, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Aug. 27, 2015	Jul. 29, 2015
Debt Instrument [Line Items]
Debt						$ 7,976,000,000	$ 6,197,000,000
Unamortized Discount						(24,000,000)	(26,000,000)
Debt Instrument, Unamortized Premium						113,000,000	0
Unamortized Debt Issuance Expense						(12,000,000)	(15,000,000)
Total Debt, Net of Discount						8,029,000,000	6,136,000,000
Capital Lease Obligations, Current						(53,000,000)	(68,000,000)
Long-Term Debt Due After One Year						7,976,000,000	6,068,000,000
Unamortized Debt Issuance Costs						12,000,000
Debt Exchange, Percent of Outstanding Notes Tendered for Exchange										99.40%
Deferred Finance Costs, Net						12,000,000
Repayments of Lines of Credit						70,000,000
Repayments of Long-term Lines of Credit						70,000,000	1,050,000,000	$ 900,000,000
Repayments of Long-term Debt [Abstract]
2014						0
2015						0
2016						0
2017						1,000,000,000
2018						0
Thereafter						6,573,000,000
Total						7,573,000,000
Line of Credit
Debt Instrument [Line Items]
Debt						$ 0	$ 0
Interest Rate						0.00%	0.00%
Debt Instrument, Offering Date					Aug. 27, 2015
Line of Credit Facility, Maximum Borrowing Capacity					$ 4,000,000,000
Credit facility aggregate short-term loans and letters of credit, maximum					$ 500,000,000
Credit facility covenant term debt to capitalization ratio maximum					65.00%
Credit facility interest rate, Eurodollar rate plus, minimum									0.90%
Credit facility fee rate basis points, minimum									0.10%
Credit facility fee rate basis points, maximum									0.25%
Credit facility interest rate, Eurodollar rate plus, maximum									1.50%
Capital Lease and Other Obligations
Debt Instrument [Line Items]
Debt						$ 403,000,000	$ 413,000,000
Interest Rate						0.00%	0.00%
Capital Lease Obligations, Current						$ (53,000,000)	$ (68,000,000)
8.25% Senior Notes, due March 1, 2019
Debt Instrument [Line Items]
Debt						$ 1,000,000,000	$ 1,000,000,000
Interest Rate						8.25%	8.25%
Senior Notes, due May 1, 2021
Debt Instrument [Line Items]
Debt						$ 693,000,000	$ 0
Interest Rate						5.625%	0.00%
4.15% Senior Notes, due December 15, 2021
Debt Instrument [Line Items]
Debt						$ 1,000,000,000	$ 1,000,000,000
Interest Rate						4.15%	4.15%
Senior Notes, due June 1, 2022
Debt Instrument [Line Items]
Debt						$ 597,000,000	$ 0
Interest Rate						5.875%	0.00%
7.25% Senior Notes, due October 15, 2023
Debt Instrument [Line Items]
Debt						$ 100,000,000	$ 100,000,000
Interest Rate						7.25%	7.25%
Unamortized Debt Issuance Expense						$ (36,000,000)	$ (35,000,000)
Senior Notes, due June 1, 2024
Debt Instrument [Line Items]
Debt						$ 499,000,000	$ 0
Interest Rate						5.875%	0.00%
Senior Notes Due November 15, 2024
Debt Instrument [Line Items]
Debt			$ 650,000,000			$ 650,000,000	$ 650,000,000
Interest Rate				3.90%		3.90%	3.90%
Debt Instrument, Offering Date			Nov. 07, 2014
Debt Instrument, Maturity Date							Nov. 15, 2024
8.00% Senior Notes, due April 1, 2027
Debt Instrument [Line Items]
Debt						$ 250,000,000	$ 250,000,000
Interest Rate						8.00%	8.00%
6.00% Senior Notes, due March 1, 2041
Debt Instrument [Line Items]
Debt						$ 850,000,000	$ 850,000,000
Interest Rate						6.00%	6.00%
5.25% Senior Notes, due November 15, 2043
Debt Instrument [Line Items]
Debt						$ 1,000,000,000	$ 1,000,000,000
Interest Rate						5.25%	5.25%
Senior Notes, due November 15, 2044
Debt Instrument [Line Items]
Debt			$ 850,000,000			$ 850,000,000	$ 850,000,000
Interest Rate				5.05%		5.05%	5.05%
Debt Instrument, Maturity Date							Nov. 15, 2044
Debt offerings proceeds, net of discount and underwriting fees				$ 1,500,000,000
7.25% Senior Debentures, due August 1, 2097
Debt Instrument [Line Items]
Debt						$ 84,000,000	$ 84,000,000
Interest Rate						7.25%	7.25%
Subsequent Event \| Senior Notes, due May 1, 2021
Debt Instrument [Line Items]
Interest Rate		5.625%
Debt Instrument, Maturity Date		May 01, 2021
Subsequent Event \| Senior Notes, due June 1, 2022
Debt Instrument [Line Items]
Interest Rate		5.875%
Debt Instrument, Maturity Date		Jun. 01, 2022
Subsequent Event \| Senior Notes, due June 1, 2024
Debt Instrument [Line Items]
Interest Rate		5.875%
Debt Instrument, Maturity Date		Jun. 01, 2024
Line of Credit \| Subsequent Event \| Credit Facility
Debt Instrument [Line Items]
Debt Instrument, Term		3 years
Line of Credit Facility, Maximum Borrowing Capacity		$ 1,400,000,000.0
Repayments of Long-term Debt [Abstract]
Proceeds from Lines of Credit	$ 1,380,000,000