Consolidated Statements of Stockholders' Equity $ in Millions	USD ($)
Balance, beginning of year at Dec. 31, 2014	$ 683
Balance, end of period at Jun. 30, 2015	683
Balance, beginning of year at Dec. 31, 2014	2,151
Additional Paid-In Capital
Stock-based compensation	(5)
Balance, end of period at Jun. 30, 2015	2,146
Balance, beginning of year at Dec. 31, 2014	9,645
Retained Earnings (Accumulated Deficit)
Dividends paid to common stockholders	(676)
Net Income (Loss)	371
Balance, end of period at Jun. 30, 2015	9,340
Accumulated other comprehensive income (loss), beginning balance at Dec. 31, 2014	400
Accumulated Other Comprehensive Income (Loss)
Other Comprehensive Income (Loss)	(257)
Accumulated other comprehensive income (loss), ending balance at Jun. 30, 2015	143
Balance, beginning of year at Dec. 31, 2014	(84)
Treasury Stock
Stock Based Compensation and Other	6
Balance, end of period at Jun. 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 Jun. 30, 2015	0
Balance, end of period at Jun. 30, 2015	683
Balance, end of period at Jun. 30, 2015	2,146
Retained Earnings (Accumulated Deficit)
Net Income (Loss)	138
Balance, end of period at Jun. 30, 2015	9,340
Accumulated other comprehensive income (loss), beginning balance at Mar. 31, 2015	421
Accumulated Other Comprehensive Income (Loss)
Other Comprehensive Income (Loss)	(278)
Accumulated other comprehensive income (loss), ending balance at Jun. 30, 2015	143
Balance, end of period at Jun. 30, 2015	(78)
Balance, end of period at Jun. 30, 2015	0
Notes Receivable for the Issuance of Common Stock
Total stockholder's equity	12,234
Total stockholder's equity	11,756
Balance, beginning of year at Dec. 31, 2015	683
Balance, end of period at Jun. 30, 2016	683
Balance, beginning of year at Dec. 31, 2015	2,153
Additional Paid-In Capital
Stock-based compensation	2
Balance, end of period at Jun. 30, 2016	2,155
Balance, beginning of year at Dec. 31, 2015	9,313
Retained Earnings (Accumulated Deficit)
Dividends paid to common stockholders	(677)
Net Income (Loss)	275
Balance, end of period at Jun. 30, 2016	8,911
Accumulated other comprehensive income (loss), beginning balance at Dec. 31, 2015	(315)
Accumulated Other Comprehensive Income (Loss)
Other Comprehensive Income (Loss)	525
Accumulated other comprehensive income (loss), ending balance at Jun. 30, 2016	210
Balance, beginning of year at Dec. 31, 2015	(78)
Treasury Stock
Stock Based Compensation and Other	5
Balance, end of period at Jun. 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 Jun. 30, 2016	0
Balance, end of period at Jun. 30, 2016	683
Balance, end of period at Jun. 30, 2016	2,155
Retained Earnings (Accumulated Deficit)
Net Income (Loss)	209
Balance, end of period at Jun. 30, 2016	8,911
Accumulated other comprehensive income (loss), beginning balance at Mar. 31, 2016	(56)
Accumulated Other Comprehensive Income (Loss)
Other Comprehensive Income (Loss)	266
Accumulated other comprehensive income (loss), ending balance at Jun. 30, 2016	210
Balance, end of period at Jun. 30, 2016	(73)
Balance, end of period at Jun. 30, 2016	0
Notes Receivable for the Issuance of Common Stock
Total stockholder's equity	$ 11,886