Stock Transactions And Stock-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Millions			1 Months Ended		3 Months Ended		9 Months Ended
	Oct. 01, 2021 USD ($) shares	Dec. 31, 2020 shares	May 31, 2020 USD ($) $ / shares shares	Mar. 31, 2019 $ / shares shares	Oct. 01, 2021 USD ($) shares	Oct. 02, 2020 shares	Oct. 01, 2021 USD ($) shares	Oct. 02, 2020 USD ($) shares	Jul. 16, 2013 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized shares to be repurchased									20,000,000
Remaining number of shares authorized to be repurchased	20,000,000				20,000,000		20,000,000
Proceeds from the sale of common stock, net of issuance costs | $							$ 0	$ 1,729
Preferred stock, proceeds from the issuance | $							$ 0	$ 1,668
Common shares reserved for issuance under the 2007 Omnibus Incentive Plan, shares	50,000,000				50,000,000		50,000,000
RSU/PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost | $	$ 211				$ 211		$ 211
Weighted average period for cost to be recognized	2 years
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost | $	$ 225				$ 225		$ 225
Weighted average period for cost to be recognized	3 years
Common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of stock			10,900,000
Common stock issued, price per share | $ / shares			$ 163.00
Common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of stock					0	0	0	10,900,000
Proceeds from the sale of common stock, net of issuance costs | $			$ 1,730
Payments of stock issuance costs | $			$ 54
Threshold consecutive trading days			20	20
Conversion of stock, shares converted					133
Preferred stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of stock					0	0	0	1,700,000
Preferred stock | Preferred stock series B
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payments of stock issuance costs | $			$ 49
Preferred stock, shares issued	1,720,000	1,720,000	1,720,000		1,720,000		1,720,000
Preferred stock, dividend rate, percent	5.00%	5.00%	5.00%
Preferred stock, liquidation preference per share | $ / shares			$ 1,000
Preferred stock, proceeds from the issuance | $			$ 1,670
Preferred stock | Preferred stock series A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, shares issued	1,650,000	1,650,000		1,650,000	1,650,000		1,650,000
Preferred stock, dividend rate, percent	4.75%	4.75%		4.75%
Preferred stock, liquidation preference per share | $ / shares				$ 1,000
Conversion of stock, shares converted					20