Consolidated Statement of Shareholder's Interest (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Shareholder's Interest [Roll Forward]
Balance at beginning of period	$ 10,604	$ 9,653
Net income	312	364
Other comprehensive income/(loss), net of tax	(82)	(187)
Distributions	(28)	(28)
Balance at end of period	10,806	9,802
Shareholder's Interest [Member]
Shareholder's Interest [Roll Forward]
Balance at beginning of period	5,217	5,274
Net income	0	0
Other comprehensive income/(loss), net of tax	0	0
Distributions	0	0
Balance at end of period	5,217	5,274
Accumulated Other Comprehensive Income/(Loss) (Note10) [Member]
Shareholder's Interest [Roll Forward]
Balance at beginning of period	717	743
Net income	0	0
Other comprehensive income/(loss), net of tax	(82)	(187)
Distributions	0	0
Balance at end of period	635	556
Retained Earnings [Member]
Shareholder's Interest [Roll Forward]
Balance at beginning of period	4,670	3,636
Net income	312	364
Other comprehensive income/(loss), net of tax	0	0
Distributions	(28)	(28)
Balance at end of period	$ 4,954	$ 3,972