Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Tax Credit Carryforward [Line Items]
Deferred tax charge (benefit) adjustment	$ 87,000,000	$ (62,000,000)	$ 286,000,000
Net tax charge (benefit) related to the establishment of deferred tax liabilities		$ (8,000,000)	$ (19,000,000)
Undistributed earnings intends to reinvest for which no tax have been provided	$ 1,600,000,000
Income tax expense (benefit) at statutory rate	35.00%	35.00%	35.00%
Gross deferred tax assets	$ 3,100,000,000	$ 3,500,000,000
Deferred tax assets, net of valuation allowances	3,000,000,000	3,400,000,000
Gross deferred tax liabilities	900,000,000	1,200,000,000
Valuation allowance	118,000,000	129,000,000
Valuation allowance - deferred tax assets relating to non-U.S subsidiaries	85,000,000	98,000,000
Increase (decrease) in valuation allowance - deferred tax assets relating to non-U.S. subsidiaries	(13,000,000)	(97,000,000)
Unrecognized tax benefits	68,000,000	88,000,000	$ 96,000,000
Unrecognized tax benefits that would impact effective tax rate if recognized	50,000,000	50,000,000
Estimated associated net tax charge impact on effective tax rate	50,000,000
Estimated associated net tax benefit impact on effective tax rate	30,000,000
Change in cash payment of unrecognized tax benefits, upper end of range	30,000,000
Unrecognized tax benefits, accrued for interest	26,000,000	29,000,000
Unrecognized tax benefits, accrued for penalties	18,000,000	24,000,000
United States | State tax carryforward
Tax Credit Carryforward [Line Items]
U.S. valuation allowance net increase (decrease)	2,000,000	$ 0
U.S. valuation allowance	$ 33,000,000