Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Tax Credit Carryforward [Line Items]
Deferred tax charges (benefits) within accumulated other comprehensive income (loss), adjustments	$ 286,000,000	$ 606,000,000	$ (272,000,000)
Deferred Foreign Income Tax Expense (Benefit)	(19,000,000)	(25,000,000)
Undistributed earnings intends to reinvest for which no tax have been provided	1,500,000,000
Foreign earnings not considered permanently reinvestment	400,000,000
Tax benefit for certain non-U.S. subsidiaries		337,000,000
Federal statutory tax rate	35.00%
Gross deferred tax assets	3,600,000,000	3,700,000,000
Deferred tax assets, net of valuation allowances	3,400,000,000	3,500,000,000
Gross deferred tax liabilities	774,000,000	1,100,000,000
Valuation allowance	226,000,000	200,000,000
Valuation allowance - deferred tax assets relating to non-U.S subsidiaries	195,000,000	178,000,000
Increase (Decrease) in valuation allowance - deferred tax assets relating to non-U.S. subsidiaries	17,000,000	(56,000,000)
Valuation allowance net increase (decrease)	9,000,000	(4,000,000)
Unrecognized tax benefits	96,000,000	147,000,000	157,000,000
Unrecognized tax benefits that would impact effective tax rate if recognized	76,000,000	125,000,000
Unrecognized tax charge with potential to be recognized in next 12 months, lower end of range	(50,000,000)
Unrecognized tax benefits with potential to be recognized in next 12 months, higher end of range	50,000,000
Change in cash payment of unrecognized tax benefits, upper end of range	25,000,000
Unrecognized tax benefits, accrued for interest	26,000,000	25,000,000
Unrecognized tax benefits, accrued for penalties	26,000,000	27,000,000
State tax carryforward
Tax Credit Carryforward [Line Items]
U.S. valuation allowance	$ 31,000,000