Consolidated Statements of Stockholders' Equity $ in Millions	USD ($)
Balance, beginning of year at Dec. 31, 2014	$ 683
Balance, end of period at Sep. 30, 2015	683
Balance, beginning of year at Dec. 31, 2014	2,151
Additional Paid-In Capital
Stock-based compensation	(1)
Balance, end of period at Sep. 30, 2015	2,150
Balance, beginning of year at Dec. 31, 2014	9,645
Retained Earnings (Accumulated Deficit)
Dividends paid to common stockholders	(744)
Net Income (Loss)	549
Balance, end of period at Sep. 30, 2015	9,450
Accumulated other comprehensive income (loss), beginning balance at Dec. 31, 2014	400
Accumulated Other Comprehensive Income (Loss)
Other Comprehensive Income (Loss)	(340)
Accumulated other comprehensive income (loss), ending balance at Sep. 30, 2015	60
Balance, beginning of year at Dec. 31, 2014	(84)
Treasury Stock
Stock Based Compensation and Other	6
Balance, end of period at Sep. 30, 2015	(78)
Balance, beginning of year at Dec. 31, 2014	(1)
Notes Receivable for the Issuance of Common Stock
Decrease (increase) in notes receivable for common stock	1
Balance, end of period at Sep. 30, 2015	0
Balance, end of period at Sep. 30, 2015	683
Balance, end of period at Sep. 30, 2015	2,150
Retained Earnings (Accumulated Deficit)
Net Income (Loss)	178
Balance, end of period at Sep. 30, 2015	9,450
Accumulated other comprehensive income (loss), beginning balance at Jun. 30, 2015	143
Accumulated Other Comprehensive Income (Loss)
Other Comprehensive Income (Loss)	(83)
Accumulated other comprehensive income (loss), ending balance at Sep. 30, 2015	60
Balance, end of period at Sep. 30, 2015	(78)
Balance, end of period at Sep. 30, 2015	0
Notes Receivable for the Issuance of Common Stock
Total stockholder's equity	12,265
Total stockholder's equity	11,756
Balance, beginning of year at Dec. 31, 2015	683
Balance, end of period at Sep. 30, 2016	683
Balance, beginning of year at Dec. 31, 2015	2,153
Additional Paid-In Capital
Stock-based compensation	10
Balance, end of period at Sep. 30, 2016	2,163
Balance, beginning of year at Dec. 31, 2015	9,313
Retained Earnings (Accumulated Deficit)
Dividends paid to common stockholders	(746)
Net Income (Loss)	618
Balance, end of period at Sep. 30, 2016	9,185
Accumulated other comprehensive income (loss), beginning balance at Dec. 31, 2015	(315)
Accumulated Other Comprehensive Income (Loss)
Other Comprehensive Income (Loss)	552
Accumulated other comprehensive income (loss), ending balance at Sep. 30, 2016	237
Balance, beginning of year at Dec. 31, 2015	(78)
Treasury Stock
Stock Based Compensation and Other	5
Balance, end of period at Sep. 30, 2016	(73)
Balance, beginning of year at Dec. 31, 2015	0
Notes Receivable for the Issuance of Common Stock
Decrease (increase) in notes receivable for common stock	0
Balance, end of period at Sep. 30, 2016	0
Balance, end of period at Sep. 30, 2016	683
Balance, end of period at Sep. 30, 2016	2,163
Retained Earnings (Accumulated Deficit)
Net Income (Loss)	343
Balance, end of period at Sep. 30, 2016	9,185
Accumulated other comprehensive income (loss), beginning balance at Jun. 30, 2016	210
Accumulated Other Comprehensive Income (Loss)
Other Comprehensive Income (Loss)	27
Accumulated other comprehensive income (loss), ending balance at Sep. 30, 2016	237
Balance, end of period at Sep. 30, 2016	(73)
Balance, end of period at Sep. 30, 2016	0
Notes Receivable for the Issuance of Common Stock
Total stockholder's equity	$ 12,195