Consolidated Statement of Shareholder's Interest (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Shareholder's Interest [Roll Forward]
Balance at beginning of period			$ 8,896	$ 10,322
Net income/(loss)	355	350	946	1,184
Other comprehensive income/(loss), net of tax	185	(514)	141	(82)
Distributions			(600)	(2,700)
Balance at end of period	9,383	8,724	9,383	8,724
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	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			141	(82)
Distributions			0	0
Balance at end of period	741	739	741	739
Retained Earnings [Member]
Shareholder's Interest [Roll Forward]
Balance at beginning of period			3,022	4,227
Net income/(loss)			946	1,184
Other comprehensive income/(loss), net of tax			0	0
Distributions			(600)	(2,700)
Balance at end of period	$ 3,368	$ 2,711	$ 3,368	$ 2,711