Consolidated Statements of Stockholders' Equity $ in Millions	USD ($)
Balance, beginning of year at Dec. 31, 2014	$ 683
Balance, end of period at Mar. 31, 2015	683
Balance, beginning of year at Dec. 31, 2014	2,151
Additional Paid-In Capital
Stock-based compensation	(8)
Balance, end of period at Mar. 31, 2015	2,143
Balance, beginning of year at Dec. 31, 2014	9,645
Retained Earnings (Accumulated Deficit)
Dividends paid to common stockholders	(608)
Net Income (Loss)	233
Balance, end of period at Mar. 31, 2015	9,270
Accumulated other comprehensive income (loss), beginning balance at Dec. 31, 2014	400
Accumulated Other Comprehensive Income (Loss)
Other Comprehensive Income (Loss)	21
Accumulated other comprehensive income (loss), ending balance at Mar. 31, 2015	421
Balance, beginning of year at Dec. 31, 2014	(84)
Treasury Stock
Stock Based Compensation and Other	5
Balance, end of period at Mar. 31, 2015	(79)
Balance, beginning of year at Dec. 31, 2014	(1)
Balance, end of period at Mar. 31, 2015	(1)
Notes Receivable for the Issuance of Common Stock
Total stockholder's equity	12,437
Total stockholder's equity	11,756
Balance, beginning of year at Dec. 31, 2015	683
Balance, end of period at Mar. 31, 2016	683
Balance, beginning of year at Dec. 31, 2015	2,153
Additional Paid-In Capital
Stock-based compensation	(7)
Balance, end of period at Mar. 31, 2016	2,146
Balance, beginning of year at Dec. 31, 2015	9,313
Retained Earnings (Accumulated Deficit)
Dividends paid to common stockholders	(609)
Net Income (Loss)	66
Balance, end of period at Mar. 31, 2016	8,770
Accumulated other comprehensive income (loss), beginning balance at Dec. 31, 2015	(315)
Accumulated Other Comprehensive Income (Loss)
Other Comprehensive Income (Loss)	259
Accumulated other comprehensive income (loss), ending balance at Mar. 31, 2016	(56)
Balance, beginning of year at Dec. 31, 2015	(78)
Treasury Stock
Stock Based Compensation and Other	5
Balance, end of period at Mar. 31, 2016	(73)
Balance, beginning of year at Dec. 31, 2015	0
Balance, end of period at Mar. 31, 2016	0
Notes Receivable for the Issuance of Common Stock
Total stockholder's equity	$ 11,470