Consolidated Statement of Shareholder's Interest (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Shareholder's Interest [Roll Forward]
Balance at beginning of period			$ 10,604	$ 9,653
Net income	718	272	1,294	911
Condolidation, Wholly Owned Subsidiary, Parent Ownership Interest, Purchase of Interest by Parent			0	3
Other comprehensive income/(loss), net of tax	(335)	176	(332)	(62)
Distributions			(244)	(56)
Balance at end of period	11,322	10,449	11,322	10,449
Shareholder's Interest [Member]
Shareholder's Interest [Roll Forward]
Balance at beginning of period			5,217	5,274
Net income			0	0
Condolidation, Wholly Owned Subsidiary, Parent Ownership Interest, Purchase of Interest by Parent			0	3
Other comprehensive income/(loss), net of tax			0	(60)
Distributions			0	0
Balance at end of period	5,217	5,217	5,217	5,217
Accumulated Other Comprehensive Income/(Loss) (Note10) [Member]
Shareholder's Interest [Roll Forward]
Balance at beginning of period			717	743
Net income			0	0
Condolidation, Wholly Owned Subsidiary, Parent Ownership Interest, Purchase of Interest by Parent			0	0
Other comprehensive income/(loss), net of tax	(335)	236	(332)	(2)
Distributions			0	0
Balance at end of period	385	741	385	741
Retained Earnings [Member]
Shareholder's Interest [Roll Forward]
Balance at beginning of period			4,670	3,636
Net income			1,294	911
Condolidation, Wholly Owned Subsidiary, Parent Ownership Interest, Purchase of Interest by Parent			0	0
Other comprehensive income/(loss), net of tax			0	0
Distributions			(244)	(56)
Balance at end of period	$ 5,720	$ 4,491	$ 5,720	$ 4,491