Supplementary Information Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Millions	Mar. 31, 2022		Dec. 31, 2021	Mar. 31, 2021		Dec. 31, 2020
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	$ 2,031		$ 4,459	$ 2,404
Cash, Cash Equivalents and Restricted Cash, Total Company	2,385	[1]	4,836	2,730	[1]	$ 3,873
Other Current Assets [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted Cash	$ 354		$ 377	$ 326

[1] See page 14 for reconciliation of cash and cash equivalents and restricted cash equivalents presented in interim Consolidated Balance Sheets to total cash, cash equivalents and restricted cash equivalents presented in the interim Consolidated Statements of Cash Flows.