Debt and Borrowing Arrangements - Tender Offers (Details) - Loans Payable - USD ($) $ in Millions	Dec. 31, 2021	Oct. 16, 2020
Debt Instrument [Line Items]
Amount Repurchased		$ 950
3.625% Notes Due May 2023
Debt Instrument [Line Items]
Interest Rate		3.625%
Amount Repurchased		$ 359
4.000% Notes Due February 2024
Debt Instrument [Line Items]
Interest Rate	4.00%	4.00%
Amount Repurchased	$ 492	$ 203
3.625% Notes Due February 2026
Debt Instrument [Line Items]
Interest Rate		3.625%
Amount Repurchased		$ 249
4.125% Notes Due May 2028
Debt Instrument [Line Items]
Interest Rate		4.125%
Amount Repurchased		$ 27
6.500% Notes Due November 2031
Debt Instrument [Line Items]
Interest Rate		6.50%
Amount Repurchased		$ 5
7.000% Notes Due August 2037
Debt Instrument [Line Items]
Interest Rate		7.00%
Amount Repurchased		$ 1
6.875% Notes Due February 2038
Debt Instrument [Line Items]
Interest Rate		6.875%
Amount Repurchased		$ 24
6.875% Notes Due January 2039
Debt Instrument [Line Items]
Interest Rate		6.875%
Amount Repurchased		$ 10
6.500% Notes Due February 2040
Debt Instrument [Line Items]
Interest Rate		6.50%
Amount Repurchased		$ 1
4.625% Notes Due May 2048
Debt Instrument [Line Items]
Interest Rate		4.625%
Amount Repurchased		$ 71