Changes in Accumulated Other Comprehensive (Loss) Income (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Changes in Other Comprehensive income
Balances as of start of period			$ (1,426,000,000)
Pension and other postretirement benefit gains	(7,000,000)	(6,000,000)	(48,000,000)	(60,000,000)
Balances as of end of period	(1,542,000,000)		(1,542,000,000)
Accumulated Other Comprehensive (Loss) Income [Member]
Changes in Other Comprehensive income
Balances as of start of period	(1,371,000,000)	(1,308,000,000)	(1,426,000,000)	(927,000,000)
Net unrealized gains (losses)	2,000,000	(25,000,000)	102,000,000	(141,000,000)
Increase (decrease) due to amounts reclassified into earnings	(12,000,000)	(23,000,000)	(66,000,000)	(69,000,000)
Net translation gain (losses) of investments in foreign operations	(414,000,000)	134,000,000	(313,000,000)	(422,000,000)
Net (losses) gains related to hedges of investment in foreign operations	246,000,000	(123,000,000)	113,000,000	160,000,000
Pension and other postretirement benefit gains	7,000,000	6,000,000	48,000,000	60,000,000
Net change in accumulated other comprehensive income (loss)	(171,000,000)	(31,000,000)	(116,000,000)	(412,000,000)
Balances as of end of period	(1,542,000,000)	(1,339,000,000)	(1,542,000,000)	(1,339,000,000)
Net Unrealized Investment Gains (Losses) on Investment Securities [Member]
Changes in Other Comprehensive income
Balances as of start of period	105,000,000	153,000,000	63,000,000	315,000,000
Net unrealized gains (losses)	2,000,000	(25,000,000)	102,000,000	(141,000,000)
Increase (decrease) due to amounts reclassified into earnings	(13,000,000)	(23,000,000)	(71,000,000)	(69,000,000)
Net change in accumulated other comprehensive income (loss)	(11,000,000)	(48,000,000)	31,000,000	(210,000,000)
Balances as of end of period	94,000,000	105,000,000	94,000,000	105,000,000
Foreign Currency Translation Adjustments [Member]
Changes in Other Comprehensive income
Balances as of start of period	(1,118,000,000)	(1,027,000,000)	(1,090,000,000)	(754,000,000)
Increase (decrease) due to amounts reclassified into earnings	1,000,000	0	5,000,000	0
Net translation gain (losses) of investments in foreign operations	(414,000,000)	134,000,000	(313,000,000)	(422,000,000)
Net (losses) gains related to hedges of investment in foreign operations	246,000,000	(123,000,000)	113,000,000	160,000,000
Net change in accumulated other comprehensive income (loss)	(167,000,000)	11,000,000	(195,000,000)	(262,000,000)
Balances as of end of period	(1,285,000,000)	(1,016,000,000)	(1,285,000,000)	(1,016,000,000)
Net Unrealized Pension and Other Postretirement Benefit Losses [Member]
Changes in Other Comprehensive income
Balances as of start of period	(358,000,000)	(434,000,000)	(399,000,000)	(488,000,000)
Pension and other postretirement benefit gains	7,000,000	6,000,000	48,000,000	60,000,000
Net change in accumulated other comprehensive income (loss)	7,000,000	6,000,000	48,000,000	60,000,000
Balances as of end of period	$ (351,000,000)	$ (428,000,000)	$ (351,000,000)	$ (428,000,000)