Accrued Expenses And Other Payables (Details) - USD ($) $ in Millions	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Accrued Liabilities and Other Liabilities [Abstract]
Derivative Liability	$ 1,161		$ 464
Employee-related Liabilities	259		235
Accrued Income Taxes, Current	251		140
Accrual for Taxes Other than Income Taxes, Current	92		99
Reinsurance Payable	23		111
Liability for Claims and Claims Adjustment Expense	247		268
Contract with Customer, Liability	90	$ 185	185
Accrued expenses and other payables	1,050		1,331
Total accrued expenses and other payables	$ 3,173	$ 2,826	$ 2,833