Consolidated Statements of Changes in Equity (USD $) In Millions, except Share data, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]
Balance at Dec. 31, 2010	$ 13,408	$ 0	$ 5,427	$ 7,979	$ (174)	$ 176
Balance (shares) at Dec. 31, 2010		75,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,352	0	0	1,331	0	21
Other comprehensive (loss) income	(467)	0	0	0	(467)	0
Distributions	(25)	0	0	0	0	(25)
Other equity transactions	(3)	0	(4)	0	0	1
Balance at Dec. 31, 2011	14,265	0	5,423	9,310	(641)	173
Balance (shares) at Dec. 31, 2011		75,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,495
Net income	1,494	0	0	1,472	0	22
Other comprehensive (loss) income	178	0	0	0	178	0
Distributions	(26)	0	0	0	0	(26)
Other equity transactions	(1)	0	0	0	0	(1)
Balance at Dec. 31, 2012	15,910	0	5,423	10,782	(463)	168
Balance (shares) at Dec. 31, 2012	75,000,000	75,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,676
Net income	1,660	0	0	1,636	0	24
Other comprehensive (loss) income	366	0	0	0	366	0
Distributions	(22)	0	0	0	0	(22)
Redemption of preferred securities of subsidiaries	(68)	0	0	0	0	(68)
Common stock issuances (shares)		2,000,000
Common stock issuances	1,000	0	1,000	0	0	0
Other equity transactions	(30)	0	(33)	0	0	3
Balance at Dec. 31, 2013	$ 18,816	$ 0	$ 6,390	$ 12,418	$ (97)	$ 105
Balance (shares) at Dec. 31, 2013	77,000,000	77,000,000