Accrued Expenses And Other Payables (Details) - USD ($) $ in Millions	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Accrued Liabilities and Other Liabilities [Abstract]
Derivative Liability	$ 1,173		$ 464
Employee-related Liabilities	295		235
Accrued Income Taxes, Current	158		140
Accrual for Taxes Other than Income Taxes, Current	97		99
Reinsurance Payable	26		111
Liability for Claims and Claims Adjustment Expense	253		268
Contract with Customer, Liability	106	$ 185	185
Accrued expenses and other payables	817		1,331
Total accrued expenses and other payables	$ 2,925	$ 2,826	$ 2,833