Consolidated Statement of Shareholder's Interest (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Shareholder's Interest [Roll Forward]
Balance at beginning of period	$ 8,896	$ 10,322
Net income/(loss)	295	451
Other comprehensive income/(loss), net of tax	208	333
Distributions	(200)	(900)
Balance at end of period	9,199	10,206
Shareholder's Interest [Member]
Shareholder's Interest [Roll Forward]
Balance at beginning of period	5,274	5,274
Net income/(loss)	0	0
Other comprehensive income/(loss), net of tax	0	0
Distributions	0	0
Balance at end of period	5,274	5,274
Accumulated Other Comprehensive Income/(Loss) (Note10) [Member]
Shareholder's Interest [Roll Forward]
Balance at beginning of period	600	821
Net income/(loss)	0	0
Other comprehensive income/(loss), net of tax	208	333
Distributions	0	0
Balance at end of period	808	1,154
Retained Earnings [Member]
Shareholder's Interest [Roll Forward]
Balance at beginning of period	3,022	4,227
Net income/(loss)	295	451
Other comprehensive income/(loss), net of tax	0	0
Distributions	(200)	(900)
Balance at end of period	$ 3,117	$ 3,778