Accrued Expenses And Other Payables (Details) - USD ($) $ in Millions	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Accrued Liabilities and Other Liabilities [Abstract]
Derivative Liability	$ 847		$ 464
Employee-related Liabilities	209		235
Accrued Income Taxes, Current	183		140
Accrual for Taxes Other than Income Taxes, Current	98		99
Reinsurance Payable	95		111
Liability for Claims and Claims Adjustment Expense	297		268
Contract with Customer, Liability	194	$ 185	185
Accrued expenses and other payables	1,112		1,331
Total accrued expenses and other payables	$ 3,035	$ 2,826	$ 2,833