Equity Changes in AOCI (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ 384		$ (1,235)
Other comprehensive income before reclassifications	1,099
Amounts reclassified from other comprehensive income	(280)
Net other comprehensive income	819		1,619	447
Ending balance	1,203		384	(1,235)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	934	[1]
Other comprehensive income before reclassifications	983	[1]
Amounts reclassified from other comprehensive income	(290)	[1]
Net other comprehensive income	693	[1]
Ending balance	1,627	[1]
Accumulated Other Comprehensive Income (Loss), Other [Member]
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(550)	[2]
Other comprehensive income before reclassifications	116	[2]
Amounts reclassified from other comprehensive income	10	[2]
Net other comprehensive income	126	[2]
Ending balance	$ (424)	[2]

[1] The amounts reclassified from AOCI represent the gain or loss recognized in earnings due to a sale of an available-for-sale security or the recognition of a net impairment in earnings.

[2] Primarily represents activity from our defined benefit pension plans.