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Debt - Senior Notes, Contingent Convertible Senior Notes and Convertible Senior Notes Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Nov. 16, 2015
Long-Term Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 9,989	$ 9,706
Noncontrolling Interest, Ownership Percentage by Parent	100.00%
Debt Instrument, Convertible, Carrying Amount of Equity Component	$ 445
Income Tax Effects Allocated Directly to Equity, Equity Transactions	165
Income Tax Effects Allocated Directly to Equity, Other	(10)
Gains (losses) on purchases or exchanges of debt	236	279	$ (197)
Cash paid to purchase debt	2,734	508	3,362
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Subsequent Adjustments	26
Senior Notes Exchanged for Shares of Common Stock [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount	$ 290
Debt Conversion, Converted Instrument, Shares Issued	53,923,925
Contingent Convertible Senior Notes Exchanged for Shares of Common Stock [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount	$ 287
Debt Conversion, Converted Instrument, Shares Issued	55,427,782
Long-term Debt [Member]
Long-Term Debt Instrument [Line Items]
Cash paid to purchase debt	$ 2,078
5.5% Contingent Convertible Senior Notes Due 2026 [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.50%
Debt Instrument, Face Amount	$ 1,250
Proceeds from issuance of senior notes, net of discount and offering costs	$ 1,235
8.00% Senior Notes Due 2025 [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	8.00%
Debt Instrument, Face Amount	$ 1,000
Proceeds from issuance of senior notes, net of discount and offering costs	$ 975
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed	35.00%
Debt Instrument, Redemption Price, Percentage	108.00%
8.00% Senior Notes Due 2025 [Member] \| Debt Instrument, Redemption, Period One [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Date of First Required Payment	Jan. 15, 2020
8.00% Senior Notes Due 2025 [Member] \| Debt Instrument, Redemption, Period Two [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Date of First Required Payment	Jan. 15, 2020
8.00% Senior Notes Due 2025 [Member] \| Debt Instrument, Redemption, Period Three [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Date of First Required Payment	Jan. 15, 2020
3.25% Senior Notes Due 2016 [Member]
Long-Term Debt Instrument [Line Items]
Gains (losses) on purchases or exchanges of debt		5
Senior Notes [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Face Amount			3,000
Payments of Financing Costs		$ 30
Proceeds from issuance of senior notes, net of discount and offering costs			2,966
Debt Instrument, Repurchased Face Amount	$ 325
Cash paid to purchase debt	$ 300
Senior Notes [Member] \| 8.00% Senior Secured Second Lien Notes Due 2022 [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	8.00%	8.00%
Debt Instrument, Face Amount	$ 2,419	$ 2,425
Senior Notes [Member] \| Ten of the Twelve Existing Notes [Member]
Long-Term Debt Instrument [Line Items]
Gains (losses) on purchases or exchanges of debt		$ 304
Debt Instrument, Face Amount	$ 990
Senior Notes [Member] \| 3.25% Senior Notes Due 2016 [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.25%	3.25%
Debt Instrument, Face Amount	$ 0	$ 381
Debt Instrument, Repurchased Face Amount		119
Cash paid to purchase debt	259
Senior Notes [Member] \| Floating Rate Senior Notes Due 2019 [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 380	1,104	$ 1,500
Senior Notes [Member] \| 4.875% Senior Notes Due 2022 [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.875%		4.875%
Debt Instrument, Face Amount	$ 451	639	$ 1,500
Senior Notes [Member] \| 6.875% Senior Notes Due 2018 [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			6.875%
Gains (losses) on purchases or exchanges of debt			$ 6
Debt Instrument, Repurchased Face Amount			97
Senior Notes [Member] \| 6.875% Senior Notes Due 2018 [Member] \| Premium on Extinguishment of Debt [Member]
Long-Term Debt Instrument [Line Items]
Gains (losses) on purchases or exchanges of debt			5
Senior Notes [Member] \| 6.875% Senior Notes Due 2018 [Member] \| Unamortized Deferred Charges on Extinguishment of Debt [Member]
Long-Term Debt Instrument [Line Items]
Gains (losses) on purchases or exchanges of debt			$ 1
Senior Notes [Member] \| 9.5% Senior Notes Due 2015 [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			9.50%
Gains (losses) on purchases or exchanges of debt			$ 99
Debt Instrument, Repurchased Face Amount			1,265
Cash paid to purchase debt			1,454
Senior Notes [Member] \| 9.5% Senior Notes Due 2015 [Member] \| Premium on Extinguishment of Debt [Member]
Long-Term Debt Instrument [Line Items]
Gains (losses) on purchases or exchanges of debt			87
Senior Notes [Member] \| 9.5% Senior Notes Due 2015 [Member] \| Unamortized Deferred Charges on Extinguishment of Debt [Member]
Long-Term Debt Instrument [Line Items]
Gains (losses) on purchases or exchanges of debt			3
Senior Notes [Member] \| 9.5% Senior Notes Due 2015 [Member] \| Unamortized Discount on Extinguishment of Debt [Member]
Long-Term Debt Instrument [Line Items]
Gains (losses) on purchases or exchanges of debt			$ 9
Convertible Debt [Member] \| Minimum [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Face Amount	50
Convertible Debt [Member] \| Maximum [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 75
Convertible Debt [Member] \| 2.5% Contingent Convertible Senior Notes Due 2037 [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.50%
Debt Instrument, Interest Rate, Effective Percentage	8.00%
Convertible Debt [Member] \| 2.25% Contingent Convertible Senior Notes Due 2038 [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.25%
Debt Instrument, Interest Rate, Effective Percentage	8.00%
Convertible Debt [Member] \| 5.5% Contingent Convertible Senior Notes Due 2026 [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.50%
Debt Instrument, Face Amount	$ 1,250	0
Debt Instrument, Interest Rate, Effective Percentage	11.50%
Contingent Convertible Debt [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount	$ 141
Cash paid to purchase debt	$ 86
Contingent Convertible Debt [Member] \| 2.5% Contingent Convertible Senior Notes Due 2037 [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.50%
Debt Instrument, Face Amount	$ 114	1,110
Contingent Convertible Debt [Member] \| 2.25% Contingent Convertible Senior Notes Due 2038 [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.25%
Debt Instrument, Face Amount	$ 200	$ 340
Contingent Convertible Debt [Member] \| 2.75% Contingent Convertible Senior Notes Due 2035 [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.75%	2.75%
Debt Instrument, Face Amount	$ 2	$ 2
Debt Instrument, Repurchased Face Amount				$ 394
Senior Notes, Retired with Proceeds from Term Loan [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount	1,451
Convertible Debt, Retired with Proceeds from Term Loan [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount	$ 708